[PATCH] D42541: [DeadArgumentElimination] Preserve llvm.dbg.values's first argument

[Djordje Todorovic via Phabricator via llvm-commits]

djtodoro created this revision.
djtodoro added reviewers: davide, aprantl, llvm-commits.
djtodoro added a project: debug-info.

Dead Argument Elimination pass when removing return value clobbers first llvm.dbg.value’s argument for live arguments of that function by replacing it with nullptr. In the next pass it will be deleted, so debug location about those arguments are lost. This change fixes it.


https://reviews.llvm.org/D42541

Files:
  include/llvm/IR/Metadata.h
  include/llvm/IR/Value.h
  lib/IR/Metadata.cpp
  lib/IR/Value.cpp
  lib/Transforms/IPO/DeadArgumentElimination.cpp
  test/Transforms/DeadArgElim/dbginfo-preserve-dbgloc.ll

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