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lowering. This also implements the fancy blend lowering for v16i16 using AVX2 and teaches the X86 backend to print shuffle masks for 256-bit PSHUFB and PBLENDW instructions. It also makes the mask decoding correct for PBLENDW instructions. The yaks, they are legion. Tests are updated accordingly. There are some missing tests for the VBLENDVB lowering, but I'll add those in a follow-up as this commit has accumulated enough cruft already. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218430 91177308-0d34-0410-b5e6-96231b3b80d8
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