[X86][SSE] Update raw mask shuffle decoders to handle UNDEF mask elts

[X86][SSE] Update raw mask shuffle decoders to handle UNDEF mask elts

Matches the approach taken in the constant pool shuffle decoders, and uses an UndefElts mask instead of uint64_t(-1) raw mask values, which doesn't work safely for i32/i64 shuffle mask sizes (as the -1 value is legal).

This allows us to remove the constant pool shuffle decoders from most of the getTargetShuffleMask variable shuffle cases (X86ISD::VPERMV3 will be handled in a future commit).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@345018 91177308-0d34-0410-b5e6-96231b3b80d8