[PATCH] D52497: [MSan] Add meaningful debug locations to [K]MSan hooks poisoning local variables

[Alexander Potapenko via Phabricator via llvm-commits]

glider created this revision.
glider added reviewers: eugenis, aprantl, rnk.
Herald added a subscriber: llvm-commits.

Add DILocation pointing to the local variable declaration site to every MSan/KMSAN hook that poisons that local variable.
The DILocation is picked from one of the debug intrinsics referencing the corresponding alloca instruction and being:

- either a `llvm.dbg.declare` intrinsic;
- or a `llvm.dbg.addr` intrinsic;
- or a `llvm.dbg.value` intrinsic with `DW_OP_deref` tag.


Repository:
  rL LLVM

https://reviews.llvm.org/D52497

Files:
  lib/Transforms/Instrumentation/MemorySanitizer.cpp
  test/Instrumentation/MemorySanitizer/alloca-dbginfo.ll

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