Freeze string literals in AutoInstrument layer #416

Job	Run time
lint	27s
lint	27s
test (2.1, gems/rails3.gemfile)	19s
test (2.1, gems/rails3.gemfile)	19s
test (2.2)	24s
test (2.2)	24s
test (2.3)	28s
test (2.3)	28s
test (2.4)	24s
test (2.4)	24s
test (2.5)	24s
test (2.5)	24s
test (2.6)	27s
test (2.6)	27s
test (2.6, gems/typhoeus.gemfile, typhoeus)	23s
test (2.6, gems/typhoeus.gemfile, typhoeus)	26s
test (2.6, gems/octoshark.gemfile)	27s
test (2.6, gems/octoshark.gemfile)	27s
test (2.6, gems/rails3.gemfile, 1.17.3)	24s
test (2.6, gems/rails3.gemfile, 1.17.3)	24s
test (2.7)	28s
test (2.7)	28s
test (2.7, true)	27s
test (2.7, true)	27s
test (3.0)	23s
test (3.0)	23s
test (3.0, true)	10s
test (3.0, true)	10s
test (3.0, gems/instruments.gemfile, instruments)	12s
test (3.0, gems/instruments.gemfile, instruments)	12s
test (3.0, gems/instruments.gemfile, true, instruments)	12s
test (3.0, gems/instruments.gemfile, true, instruments)	12s
test (3.0, gems/sidekiq.gemfile, sidekiq_install)	20s
test (3.0, gems/sidekiq.gemfile, sidekiq_install)	20s
test (3.1)	14s
test (3.1)	14s
test (3.2)	13s
test (3.2)	13s
	13m 35s

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