tree-optimization/117104 - add missed guards to max(a,b) != a simplification

For vector types we have to make sure the comparison result is a vector
type and the resulting compare operation is supported.  As the resulting
compare is never an equality compare I didn't bother to check for the
cbranch case.

	PR tree-optimization/117104
	* match.pd ((cmp:c (minmax:c @0 @1) @0) -> (out @0 @1)): Properly
	guard the vector case.

	* gcc.dg/pr117104.c: New testcase.