[X86][SSE] Replace 128-bit SSE41 PMOVSX intrinsics with native IR
This patches removes the x86.sse41.pmovsx* intrinsics, provides a suitable upgrade path and updates relevant tests to sign extend a subvector instead. LLVM counterpart to D12835 Differential Revision: http://reviews.llvm.org/D13002 llvm-svn: 248368
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