[PATCH] D133232: [msan] Try to disambiguate warnings origns

[Vitaly Buka via Phabricator via llvm-commits]

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If multiple warnings created on the same instruction (debug location)
it can be difficult to fugure out which input values is the cause.

This patches chains origins just before the warning using last origins
update debug informations.

To avoid inflating binary unnececary, we do this only when uncertanty is
high ennough, 3 warnings by default. On average it adds 0.4% to the
.text size.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D133232

Files:
  llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
  llvm/test/Instrumentation/MemorySanitizer/disambiguate-origin.ll

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