[PATCH] D133291: [Assignment Tracking][8/*] Add DIAssignID merging utilities

[Orlando Cazalet-Hyams via Phabricator via llvm-commits]

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Add `Instruction::mergeDIAssignID(ArrayRef<const Instruction* > SourceInstructions)` which merges the `DIAssignID` metadata attachments on the `SourceInstructions` and `this` and replaces uses of the original IDs with the new shared one.

This is used when stores are merged, for example sinking stores out of a if-diamond CFG or vectorizing contiguous stores.


https://reviews.llvm.org/D133291

Files:
  llvm/include/llvm/IR/Instruction.h
  llvm/lib/IR/DebugInfo.cpp
  llvm/lib/Transforms/Utils/Local.cpp
  llvm/unittests/IR/DebugInfoTest.cpp

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