[X86] Change the MOV32ri64 pseudo instruction to def a GR64 directly instead of wrapp...

[X86] Change the MOV32ri64 pseudo instruction to def a GR64 directly instead of wrapping it in a SUBREG_TO_REG.

Now we switch to the subregister in expandPostRAPseudos where we already switched the opcode.

This simplifies a few isel patterns that used the pseudo directly. And magically seems to have improved our ability to CSE it in the undef-label.ll test.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@339496 91177308-0d34-0410-b5e6-96231b3b80d8