Add a more useful profile guided optimization test script

[svaarala]

The test script should exercise usual code paths for all built-ins so that the performance profiling data accurately reflects the relative frequency of most practical code paths. Current PGO test set in the Makefile is a dummy placeholder.

• Come up with a test set as a separate test file or as sequence of individual tests
• The full tests/ecmascript test run could be useful (execute with runtest.py), but might be too heavy for practical Makefiles
• Add Octane to profiling set
• Document that duktape.c can be profile optimized with a dummy main (e.g. "duk") and the profile then used in an application build
• Consider bundling the PGO test file into the distributable along with a PGO example

[svaarala]

Here's some results with the current quite dummy profile test set:

• duk.O2.master is from make duk.O2from master before hot/cold attributes
• duk.O2.hotcold is master + hot/cold attributes merge
• duk.O2.pgo is from make duk-pgo.O2 which is the same as make duk.O2 but with PGO
• duk.O2.perfpgo is make duk-perf.O2 with PGO

Most operations are faster in the PGO version, for example test-fib.js improves from 6.4 seconds to 3.8 seconds, test-call-basic-1.js improves from 8.0 seconds to 5.8 seconds. The -O2 PGO binary is also 24kB smaller.

But tests for functionality not covered by the profile set can be slower, for example TextEncoder/TextDecoder and Unicode handling is a bit slower. Those would be fixed by improving the profile test set. Ideally the distributable would provide a single JS file to execute for getting a reasonable PGO baseline.

	duk.O2.perfpgo	duk.O2.pgo	duk.O2.hotcold	duk.O2.master
test-add-fastint.js	0.43	0.47	0.66	0.67
test-add-float.js	0.42	0.47	0.68	0.63
test-add-nan-fastint.js	0.60	0.65	0.78	0.74
test-add-nan.js	0.41	0.51	0.66	0.67
test-arith-add.js	1.71	1.92	2.58	2.73
test-arith-div.js	6.36	6.67	7.31	7.33
test-arith-mod.js	6.35	6.55	6.69	6.71
test-arith-mul.js	2.99	3.14	3.98	3.62
test-arith-sub.js	1.78	2.04	2.78	2.69
test-array-append.js	0.49	0.49	0.54	0.52
test-array-cons-list.js	0.73	0.77	0.88	0.83
test-array-foreach.js	2.15	2.23	2.67	2.73
test-array-literal.js	1.53	1.54	1.63	1.59
test-array-pop.js	1.60	1.70	2.24	2.21
test-array-push.js	1.82	1.93	2.44	2.39
test-array-read-lenloop.js	1.44	1.52	1.91	2.06
test-array-read.js	1.64	1.80	1.80	1.78
test-array-sort.js	3.43	3.51	3.28	3.42
test-array-write-length.js	1.18	1.40	1.66	1.61
test-array-write.js	1.56	2.51	1.78	1.73
test-assign-add.js	3.25	3.61	3.70	3.70
test-assign-addto-nan.js	0.97	1.02	1.35	1.23
test-assign-addto.js	3.29	3.63	3.71	3.74
test-assign-boolean.js	4.71	4.71	4.70	4.71
test-assign-const-int.js	2.11	2.39	2.49	2.44
test-assign-const-int2.js	4.73	4.94	5.84	4.65
test-assign-const.js	3.65	3.98	4.01	3.85
test-assign-literal.js	3.30	3.76	3.75	3.78
test-assign-proplhs-reg.js	2.29	2.47	2.55	2.73
test-assign-proprhs.js	1.88	1.90	2.68	2.81
test-assign-reg.js	2.42	2.68	2.81	2.80
test-base64-decode-whitespace.js	1.88	1.89	1.87	1.86
test-base64-decode.js	1.63	1.62	1.51	1.52
test-base64-encode.js	1.92	1.89	1.71	1.70
test-bitwise-ops.js	1.46	1.56	1.83	1.95
test-break-fast.js	1.15	1.32	1.40	1.43
test-break-slow.js	6.69	7.25	7.75	7.75
test-buffer-nodejs-read.js	2.24	2.35	2.36	2.34
test-buffer-nodejs-write.js	3.64	3.73	3.09	3.06
test-buffer-object-read.js	2.23	2.36	2.37	2.32
test-buffer-object-write.js	3.62	3.73	3.10	3.07
test-buffer-plain-read.js	1.79	1.85	1.93	1.91
test-buffer-plain-write.js	1.70	1.75	1.88	1.84
test-call-basic-1.js	5.27	5.78	8.08	7.99
test-call-basic-2.js	5.26	5.78	8.02	7.99
test-call-basic-3.js	6.95	7.76	10.01	10.07
test-call-basic-4.js	14.11	15.42	18.20	18.43
test-call-native.js	10.74	11.71	13.97	13.47
test-call-prop.js	2.73	2.90	4.35	4.32
test-call-reg-new.js	5.26	5.51	6.47	6.51
test-call-reg.js	2.00	2.16	3.04	2.98
test-call-var.js	4.10	4.38	7.22	7.17
test-compile-mandel-nofrac.js	10.14	10.41	10.39	10.49
test-compile-mandel.js	13.11	13.55	13.52	13.48
test-compile-short.js	5.85	6.16	6.52	6.59
test-compile-string-ascii.js	6.50	6.49	6.68	6.70
test-continue-fast.js	1.52	1.83	1.80	1.78
test-continue-slow.js	7.19	7.33	7.80	7.85
test-empty-loop-slowpath.js	1.12	1.20	1.69	1.66
test-empty-loop.js	1.14	1.34	1.72	1.61
test-enum-basic.js	3.09	3.31	3.49	3.54
test-equals-fastint.js	0.49	0.51	0.58	0.52
test-equals-nonfastint.js	0.60	0.67	0.61	0.61
test-error-create.js	1.48	1.52	1.97	2.01
test-fib.js	3.74	3.84	6.52	6.41
test-global-lookup.js	4.28	4.40	7.37	7.81
test-hello-world.js	0.00	0.00	0.00	0.00
test-hex-decode.js	3.60	3.61	3.60	3.61
test-hex-encode.js	2.95	3.01	2.82	2.84
test-jc-serialize-indented.js	6.81	6.79	3.30	3.29
test-jc-serialize.js	2.27	2.27	2.18	2.16
test-json-parse-hex.js	4.09	4.10	3.18	3.22
test-json-parse-integer.js	2.77	2.70	2.89	2.78
test-json-parse-number.js	5.12	5.21	5.04	5.04
test-json-parse-string.js	5.71	5.69	5.59	5.36
test-json-serialize-fastpath-loop.js	6.66	6.73	3.50	3.46
test-json-serialize-forceslow.js	9.69	9.88	9.09	9.17
test-json-serialize-hex.js	1.53	1.53	1.49	1.45
test-json-serialize-indented-deep100.js	1.92	1.95	1.69	1.69
test-json-serialize-indented-deep25.js	7.10	7.02	3.16	3.21
test-json-serialize-indented-deep500.js	1.19	1.20	1.07	1.09
test-json-serialize-indented.js	12.15	12.11	5.55	5.55
test-json-serialize-jsonrpc-message.js	2.01	2.04	2.00	1.95
test-json-serialize-nofrac.js	0.60	0.64	0.59	0.58
test-json-serialize-plainbuf.js	2.45	2.46	2.46	2.50
test-json-serialize-slowpath-loop.js	4.31	4.46	4.19	4.16
test-json-serialize.js	6.86	6.92	6.06	6.07
test-json-string-bench.js	2.51	2.51	3.31	3.35
test-json-string-stringify.js	5.31	5.32	5.06	5.10
test-jx-serialize-bufobj-forceslow.js	4.00	4.08	4.39	4.35
test-jx-serialize-bufobj.js	1.54	1.58	1.58	1.59
test-jx-serialize-indented.js	6.84	6.83	3.28	3.32
test-jx-serialize.js	2.27	2.35	2.14	2.16
test-mandel.js	2.02	2.24	2.96	2.84
test-object-garbage-2.js	4.63	4.65	4.93	4.94
test-object-garbage.js	4.02	4.09	4.39	4.66
test-object-literal.js	2.93	2.94	3.13	3.11
test-prop-read-1024.js	2.23	2.30	3.06	3.17
test-prop-read-16.js	2.22	2.33	3.06	3.14
test-prop-read-256.js	2.25	2.31	3.08	3.13
test-prop-read-32.js	2.29	2.36	3.01	3.15
test-prop-read-4.js	2.20	2.24	3.21	3.34
test-prop-read-48.js	2.23	2.31	3.04	3.14
test-prop-read-64.js	2.26	2.30	3.05	3.18
test-prop-read-8.js	2.24	2.30	3.11	3.19
test-prop-read.js	2.23	2.33	3.28	3.42
test-prop-write-1024.js	2.58	3.18	3.00	2.95
test-prop-write-16.js	2.64	2.96	2.91	2.95
test-prop-write-256.js	2.61	2.90	2.95	2.92
test-prop-write-32.js	2.62	2.95	2.92	2.99
test-prop-write-4.js	2.58	2.85	2.98	3.07
test-prop-write-48.js	2.60	2.80	2.97	2.89
test-prop-write-64.js	2.59	2.88	2.98	2.89
test-prop-write-8.js	2.59	2.91	2.95	2.94
test-prop-write.js	2.58	3.00	2.98	3.02
test-random.js	1.45	1.63	2.31	2.26
test-reg-readwrite-object.js	3.05	3.21	3.11	3.16
test-reg-readwrite-plain.js	1.74	2.02	2.02	2.04
test-regexp-case-insensitive.js	0.00	29.56	24.86	25.69
test-regexp-compile.js	2.11	2.11	2.10	2.10
test-regexp-execute.js	1.37	1.40	1.45	1.44
test-regexp-string-parse.js	10.77	10.63	5.87	5.87
test-strict-equals-fastint.js	0.47	0.51	0.62	0.54
test-strict-equals-nonfastint.js	0.55	0.57	0.63	0.60
test-string-array-concat.js	4.90	4.99	5.54	5.43
test-string-arridx.js	1.48	1.62	1.67	1.69
test-string-charlen-ascii.js	1.11	1.13	1.10	1.14
test-string-charlen-nonascii.js	2.50	2.53	2.62	2.66
test-string-compare.js	1.85	1.93	2.08	2.00
test-string-decodeuri.js	4.01	3.89	3.74	3.50
test-string-encodeuri.js	4.37	4.39	4.01	4.12
test-string-garbage.js	3.87	4.09	4.06	4.08
test-string-intern-grow-short.js	3.34	3.45	3.90	3.88
test-string-intern-grow-short2.js	3.29	3.37	3.81	3.79
test-string-intern-grow.js	4.58	4.62	4.69	4.73
test-string-intern-grow2.js	1.29	1.34	1.41	1.46
test-string-intern-match-short.js	1.67	1.68	1.97	2.00
test-string-intern-match.js	0.19	0.18	0.22	0.22
test-string-intern-miss-short.js	1.89	1.97	2.26	2.27
test-string-intern-miss.js	1.05	1.02	1.14	1.20
test-string-number-list.js	0.61	0.65	0.81	0.79
test-string-plain-concat.js	0.86	0.85	0.88	0.84
test-string-uppercase.js	2.76	3.62	2.19	2.22
test-textdecoder-ascii.js	2.81	2.52	2.31	2.48
test-textdecoder-nonascii.js	3.44	3.40	3.03	3.01
test-textencoder-ascii.js	5.00	4.48	4.29	4.34
test-textencoder-nonascii.js	13.77	13.32	9.99	10.77
test-try-catch-nothrow.js	2.35	2.46	2.54	2.56
test-try-catch-throw.js	34.79	34.76	38.30	38.09
test-try-finally-nothrow.js	2.94	3.21	3.26	3.29
test-try-finally-throw.js	43.89	46.34	48.02	47.20

[svaarala]

Octane is now included by the Makefile.