[X86] Move the 'vmovq.s' and similar assembly strings for EVEX vector moves...

[X86] Move the 'vmovq.s' and similar assembly strings for EVEX vector moves with reversed operands to InstAliases.

The .s assembly strings allow the reversed forms to be targeted from assembly which matches gas behavior. But when printing the instructions we should print them without the .s to match other tooling like objdump. By using InstAliases we can use the normal string in the instruction and just hide it from the assembly parser.

Ideally we'd add the .s versions to the legacy SSE and VEX versions as well for full compatibility with gas. Not sure how we got to state where only EVEX was supported.

llvm-svn: 334920