Commits on Jun 30, 2022

1. Optionally enable LLVM profile continuous mode …

   LLVM's profile instrumentation offers a continuous mode in which
   counters are continuously synced to a file rather than being dumped
   once in an exit hook. This is useful for coverage runs that include
   binaries that exit abnormally (e.g. in failure tests), but may require
   additional compiler flags and can negatively impact runtime performance
   and memory usage.
   
   Enabling continuous mode requires adding the "%c" modifier to the value
   of the LLVM_PROFILE_FILE environment variable. With this commit, the
   collect_coverage.sh script adds the modifier if the test environment has
   the variable LLVM_PROFILE_CONTINUOUS_MODE set. This allows both all and
   individual tests to use continuous mode by setting the variable, either
   via --test_env or the env attribute.
   
   Closes #15166.
   
   PiperOrigin-RevId: 454558752
   Change-Id: Id03d00d0644742e336feab41ea479d7d8527f6c4

   

   fmeum authored and ckolli5 committed Jun 30, 2022
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