[X86][SSE] Select domain for 32/64-bit partial loads for EltsFromConsecutiveLoads

Choose between MOVD/MOVSS and MOVQ/MOVSD depending on the target vector type.

This has a lot fewer test changes than trying to add this to X86InstrInfo::setExecutionDomain.....

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@259816 91177308-0d34-0410-b5e6-96231b3b80d8
9 files changed