[PATCH] Fix for PR23103. Correctly propagate the 'IsUndef' flag to the register operands of a commuted instruction.

[Quentin Colombet]

Hi Andrea,

Looks good to me with a nit on the test case.

Thanks,
-Quentin


================
Comment at: test/CodeGen/X86/pr23103.ll:1
@@ +1,2 @@
+; RUN: llc -verify-machineinstrs -mtriple=x86_64-unknown-unknown -mcpu=generic -mattr=+avx < %s
+
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Please add a few check lines, so to be sure we generate something sensible.

http://reviews.llvm.org/D9406

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