MATCH: [PR111348] add missing :c to cmp in the `(a CMP b) ? minmax<a, c> : minmax...

MATCH: [PR111348] add missing :c to cmp in the `(a CMP b) ? minmax<a, c> : minmax<b, c>` pattern

When I added this pattern in r14-337-gc43819a9b4cd, I had missed the :c on the cmp
part of the pattern meaning there might be some missing optimizations happening.
The testcase shows an example of the missed optmization.

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

	PR tree-optimization/111348

gcc/ChangeLog:

	* match.pd (`(a CMP b) ? minmax<a, c> : minmax<b, c>`): Add :c on
	the cmp part of the pattern.

gcc/testsuite/ChangeLog:

	* gcc.dg/tree-ssa/minmax-26.c: New test.