[PATCH] D20144: Fix constant folding of addrspacecast

[Matt Arsenault via llvm-commits]

arsenm updated this revision to Diff 58019.
arsenm added a comment.

Only need to handle null


http://reviews.llvm.org/D20144

Files:
  lib/IR/ConstantFold.cpp
  test/Assembler/ConstantExprFoldCast.ll
  test/Transforms/InstCombine/addrspacecast.ll
  unittests/IR/ConstantsTest.cpp

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