[X86] Cleanup SLM SSE shift and CMPGTQ scheduler model numbers

These were causing weird mismatches for the D103695 script report as I'm trying to enable cost kinds support for vector shift and integer comparisons.

The SSE shifts by (non-constant) scalar are half-rate but still only 1uop and PCMPGT is half-rate and only on Pipe0 (although not as slow as PCMPEQQ which we already handle).