Commits on Oct 20, 2023

1. coverage: Force -Copt-level=2 in the unreachable-code test …

   This test is mainly for detecting problems triggered by MIR optimizations, but
   the run-coverage tests don't enable optimization by default.
   
   (The coverage-map copy has also been updated, to keep the two tests in sync.)

   

   Zalathar committed Oct 20, 2023
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2. coverage: Repair instrumented functions that have lost all their coun… …

   …ters
   
   If a function has been instrumented for coverage, but MIR optimizations
   subsequently remove all of its counter-increment statements, then we won't emit
   LLVM counter-increment intrinsics. LLVM will think the function is not
   instrumented, and it will disappear from coverage mappings and coverage
   reports.
   
   This new MIR pass detects when that has happened, and re-inserts a dummy
   counter-increment statement so that LLVM knows to treat the function as
   instrumented.

   

   Zalathar committed Oct 20, 2023
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3. Allow MIR pass UnreachableProp when coverage is enabled …

   Now that coverage has a dedicated MIR pass to detect and repair instrumented
   functions that have lost all their counters, it should be OK to permit this
   pass in coverage builds.

   

   Zalathar committed Oct 20, 2023
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