MATCH: PR 106164 : Optimize `(X CMP1 Y) AND/IOR (X CMP2 Y)`

MATCH: PR 106164 : Optimize `(X CMP1 Y) AND/IOR (X CMP2 Y)`

I noticed that there are patterns that optimize
`(X CMP1 CST1) AND/IOR (X CMP2 CST2)` and we can easily extend
them to support the  `(X CMP1 Y) AND/IOR (X CMP2 Y)` by saying they
compare equal. This allows for this kind of optimization for integral
and pointer types (which have the same semantics).

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

gcc/ChangeLog:

	PR tree-optimization/106164
	* match.pd: Extend the `(X CMP1 CST1) AND/IOR (X CMP2 CST2)`
	patterns to support `(X CMP1 Y) AND/IOR (X CMP2 Y)`.

gcc/testsuite/ChangeLog:

	PR tree-optimization/106164
	* gcc.dg/tree-ssa/cmpbit-1.c: New test.