Commits on Jul 4, 2024

1. [SanitizerBinaryMetadata] Fix multi-version sanitizer metadata …

   It should be valid to combine TUs that have different versions of
   sanitizer metadata. However, this had not been possible due to giving
   sanitizer metadata sections, constructors, and destructors (that call
   callbacks) the same name for different versions.
   
   This would then result in the linker attempting to merge sections that
   contain metadata of different versions, as well as picking any one of
   the constructors or destructors due to having the same COMDAT key. The
   end result is that consumers of this data would end up interpreting the
   metadata incorrectly.
   
   Although combining old and new versions is not recommended, more
   realistic is combining TUs that have been compiled with different target
   code models (which are also encoded in the sanitizer metadata version).
   
   To fix, and properly support multi-version sanitizer metadata, attach
   the version to section names and internal constructor and destructor
   names. The ABI remains unchanged.

   

   melver committed Jul 4, 2024
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