[PATCH] [CodeGenPrepare] Improved logic to speculate calls to cttz/ctlz.

[Andrea Di Biagio]

Here is an updated patch.
I improved a couple of comments and added more conservative checks.


http://reviews.llvm.org/D6853

Files:
  lib/CodeGen/CodeGenPrepare.cpp
  test/CodeGen/X86/cttz-ctlz.ll

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