[PATCH] D40650: [InstSimplify] Fold insertelement into undef if index is out of bounds

[Igor Laevsky via Phabricator via llvm-commits]

igor-laevsky updated this revision to Diff 125493.
igor-laevsky added a comment.

Add constant folding. 
This breaks `InstSimplify/pr28725.ll`. However it's now folded into constant expression and instcombine simplifies it fully. Added relevant test case to the instcombine.


https://reviews.llvm.org/D40650

Files:
  include/llvm/Analysis/ConstantFolding.h
  include/llvm/Analysis/InstructionSimplify.h
  lib/Analysis/InstructionSimplify.cpp
  test/Transforms/InstCombine/pr28725.ll
  test/Transforms/InstSimplify/insertelement.ll
  test/Transforms/InstSimplify/pr28725.ll

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