tree-optimization: [PR100864] `(a&!b) | b` is not opimized to `a | b` for comparisons

tree-optimization: [PR100864] `(a&!b) | b` is not opimized to `a | b` for comparisons

This is a new version of the patch.
Instead of doing the matching of inversion comparison directly inside
match, creating a new function (bitwise_inverted_equal_p) to do it.
It is very similar to bitwise_equal_p that was added in r14-2751-g2a3556376c69a1fb
but instead it says `expr1 == ~expr2`. A follow on patch, will
use this function in other patterns where we try to match `@0` and `(bit_not @0)`.

Changed the name bitwise_not_equal_p to bitwise_inverted_equal_p.

Committed as approved after a Bootstrapped and test on x86_64-linux-gnu with no regressions.

	PR tree-optimization/100864

gcc/ChangeLog:

	* generic-match-head.cc (bitwise_inverted_equal_p): New function.
	* gimple-match-head.cc (bitwise_inverted_equal_p): New macro.
	(gimple_bitwise_inverted_equal_p): New function.
	* match.pd ((~x | y) & x): Use bitwise_inverted_equal_p
	instead of direct matching bit_not.

gcc/testsuite/ChangeLog:

	* gcc.dg/tree-ssa/bitops-3.c: New test.