[X86] Remove alternate CodeGenOnly version of (v)movq that declared the load...

[X86] Remove alternate CodeGenOnly version of (v)movq that declared the load size as i128mem. Change all uses to the use the i64mem version.

I'm sure this caused the load size to misprint in Intel syntax output. We were also inconsistent about which patterns used which instruction between VEX and EVEX.

There are two different reg/reg versions of movq, one from a GPR and one from the lower 64-bits of an XMM register. This changes the loading folding table to use the single i64mem memory form for folding both cases. But we need to use TB_NO_REVERSE to prevent a duplicate entry in the unfolding table.

llvm-svn: 287622