Match: Add maybe_bit_not instead of plain matching

Match: Add maybe_bit_not instead of plain matching

While working on adding matching of negative expressions of `a - b`,
I noticed that we started to have "duplicated" patterns due to not having
a way to match maybe negative expressions. So I went back to what I did for
bit_not and decided to improve the situtation there so for some patterns
where we had 2 operands of an expression where one could have been a bit_not,
add back maybe_bit_not.
This does not add maybe_bit_not in every place were bitwise_inverted_equal_p
is used, just the ones were 2 operands of an expression could be swapped.

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

gcc/ChangeLog:

	* match.pd (bit_not_with_nop): Unconditionalize.
	(maybe_cmp): Likewise.
	(maybe_bit_not): New match pattern.
	(`~X & X`): Use maybe_bit_not and add `:c` back.
	(`~x ^ x`/`~x | x`): Likewise.

Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>