[PATCH] [X86] Fix pattern match for 32-to-64-bit zext in the presence of AssertSext

[Michael Kuperstein]

Hi spatel, rsmith, nadav,

This fixes PR20494 ( http://llvm.org/bugs/show_bug.cgi?id=20494 ).
I'm not at all sure this is the right way to fix it, other ideas are welcome.

http://reviews.llvm.org/D6128

Files:
  lib/Target/X86/X86InstrCompiler.td
  test/CodeGen/X86/2014-11-04-TruncZext.ll
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