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

[Michael Kuperstein]

Uploaded diff with proper context, sorry about the first one.

http://reviews.llvm.org/D6128

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