[PATCH] Fix use of DemandedMask to NewMask for SIGN_EXTEND_INREG

[Nadav Rotem]

Okay, so if the code is executed then we should try to come up with a testcase that exposes the bug that you found. Can you modify the test cases that broke and try to expose the bug?


> On Dec 30, 2014, at 3:50 AM, Gil Rapaport <gil.rapaport at intel.com> wrote:
> 
> Removing this optimization breaks CodeGen/X86/vector-blend.ll & CodeGen/X86/vselect-avx.ll.
> 
> 
> http://reviews.llvm.org/D6321
> 
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