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

[Michael Kuperstein]

Shortened the testcase and changed the name.
I think checking for a mov with the specific registers is the right thing to do, as the registers are determined by the ABI - the function parameter must come in ecx, and the ret value must go to eax.
Nadav, if you think that's too specific, let me know.

Michael

http://reviews.llvm.org/D6128

Files:
  lib/Target/X86/X86InstrCompiler.td
  test/CodeGen/X86/TruncAssertZext.ll
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