MATCH: extend min_value/max_value match to vectors

MATCH: extend min_value/max_value match to vectors

This simple patch extends the min_value/max_value match to vector integer types.
Using uniform_integer_cst_p makes this easy.

OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions.

The testcases pr110915-*.c are the same as pr88784-*.c except using vector
types instead.

	PR tree-optimization/110915

gcc/ChangeLog:

	* match.pd (min_value, max_value): Extend to vector constants.

gcc/testsuite/ChangeLog:

	* gcc.dg/pr110915-1.c: New test.
	* gcc.dg/pr110915-10.c: New test.
	* gcc.dg/pr110915-11.c: New test.
	* gcc.dg/pr110915-12.c: New test.
	* gcc.dg/pr110915-2.c: New test.
	* gcc.dg/pr110915-3.c: New test.
	* gcc.dg/pr110915-4.c: New test.
	* gcc.dg/pr110915-5.c: New test.
	* gcc.dg/pr110915-6.c: New test.
	* gcc.dg/pr110915-7.c: New test.
	* gcc.dg/pr110915-8.c: New test.
	* gcc.dg/pr110915-9.c: New test.