[PATCH] D143484: [SanitizerBinaryMetadata] Emit constants as ULEB128

[Marco Elver via Phabricator via cfe-commits]

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Emit all constant integers produced by SanitizerBinaryMetadata as
ULEB128 to further reduce binary space used. Increasing the version is
not necessary given this change depends on (and will land) along with
the bump to v2.

To support this, the !pcsections metadata format is extended to allow
for per-section options, encoded in the first MD operator which must
always be a string and contain the section: "<section>!<options>".

Depends on D143482 <https://reviews.llvm.org/D143482>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D143484

Files:
  clang/test/CodeGen/sanitize-metadata.c
  compiler-rt/test/metadata/common.h
  llvm/docs/PCSectionsMetadata.rst
  llvm/include/llvm/Transforms/Instrumentation/SanitizerBinaryMetadata.h
  llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
  llvm/lib/CodeGen/SanitizerBinaryMetadata.cpp
  llvm/lib/Transforms/Instrumentation/SanitizerBinaryMetadata.cpp
  llvm/test/CodeGen/X86/pcsections.ll
  llvm/test/Instrumentation/SanitizerBinaryMetadata/atomics.ll

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