[X86][SSE] Speed up constant pool shuffle mask decoding with direct copy (PR32037).

If the constants are already the correct size, we can copy them directly into the shuffle mask.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@297381 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed