MATCH: [PR111346] `X CMP MINMAX` pattern missing :c on CMP

MATCH: [PR111346] `X CMP MINMAX` pattern missing :c on CMP

I noticed this while working on other MINMAX optimizations. It was
hard to find a simplified testcase though because it was dependent on
the ssa name versions. Adding the `:c` to cmp allows the pattern to
be match for the case where minmax as the first operand of the comparison
rather than the second.

Committed as obvious after a bootstrap/test on x86_64-linux-gnu.

	PR tree-optimization/111346

gcc/ChangeLog:

	* match.pd (`X CMP MINMAX`): Add `:c` on the cmp part
	of the pattern

gcc/testsuite/ChangeLog:

	* gcc.dg/tree-ssa/minmaxcmp-1.c: New test.