[PATCH] D38944: [GVN] Handle removal of first implicit CF instruction correctly

[Max Kazantsev via Phabricator via llvm-commits]

mkazantsev created this revision.

When erasing an instruction, we can erase the one which is the first implicit
control flow instruction in the block. This will invalidate the respective map.
This patch ensures that we re-calculate the `FirstImplicitControlFlowInsts` for
a block every time we remove the first implicit CF instruction.


https://reviews.llvm.org/D38944

Files:
  include/llvm/Transforms/Scalar/GVN.h
  lib/Transforms/Scalar/GVN.cpp
  test/Transforms/GVN/PRE/2017-10-16-LoadPRECrash.ll

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