Extend optimization for integer bit test on __atomic_fetch_[or|and]_*

Extend optimization for integer bit test on __atomic_fetch_[or|and]_*

Extend optimization for

_1 = __atomic_fetch_or_4 (ptr_6, 0x80000000, _3);
_5 = (signed int) _1;
_4 = _5 >= 0;

to

_1 = __atomic_fetch_or_4 (ptr_6, 0x80000000, _3);
_5 = (signed int) _1;
if (_5 >= 0)

gcc/

	PR middle-end/102566
	* tree-ssa-ccp.cc (optimize_atomic_bit_test_and): Also handle
	if (_5 < 0) and if (_5 >= 0).

gcc/testsuite/

	PR middle-end/102566
	* g++.target/i386/pr102566-7.C