[PATCH] D22238: Reapply "InstCombine: Reduce trunc (shl x, K) width."

[Matt Arsenault via llvm-commits]

arsenm created this revision.
arsenm added a reviewer: majnemer.
arsenm added a subscriber: llvm-commits.

This reapplies r272987 with a fix for infinitely looping
when the truncated value is another shift of a constant.

http://reviews.llvm.org/D22238

Files:
  lib/Transforms/InstCombine/InstCombineCasts.cpp
  test/Transforms/InstCombine/2011-05-28-swapmulsub.ll
  test/Transforms/InstCombine/cast.ll
  test/Transforms/InstCombine/icmp.ll
  test/Transforms/InstCombine/trunc.ll

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