tree-optimization/113126 - vector extension compare optimization

The following makes sure the resulting boolean type is the same
when eliding a float extension.

	PR tree-optimization/113126
	* match.pd ((double)float CMP (double)float -> float CMP float):
	Make sure the boolean type is the same.
	* fold-const.cc (fold_binary_loc): Likewise.

	* gcc.dg/torture/pr113126.c: New testcase.