[X86] combineSelect fold 'smin' style pattern select(pcmpgt(RHS, LHS), LHS,...

[X86] combineSelect fold 'smin' style pattern select(pcmpgt(RHS, LHS), LHS, RHS) -> select(pcmpgt(LHS, RHS), RHS, LHS) if pcmpgt(LHS, RHS) already exists

Avoids repeated commuted comparisons when we're performing min/max and clamp patterns