PR68264: Use unordered comparisons for tree-call-cdce.c

PR68264: Use unordered comparisons for tree-call-cdce.c

As reported in PR 68264, tree-call-cdce.c should be using unordered
comparisons for the range checks, in order to avoid raising FE_INVALID
for quiet NaNs.

Tested on x86_64-linux-gnu and aarch64-linux-gnu.  The test failed on
aarch64-linux-gnu before the patch, but it didn't on x86_64-linux-gnu
because it used unordered comparisons for the previous ordered tree codes.

gcc/
	PR tree-optimization/68264
	* tree-call-cdce.c (gen_one_condition): Update commentary.
	(gen_conditions_for_pow_int_base): Invert the sense of the tests
	passed to gen_one_condition.
	(gen_conditions_for_domain): Likewise.  Use unordered comparisons.
	(shrink_wrap_one_built_in_call): Invert the sense of the tests,
	using EDGE_FALSE_VALUE for edges to the call block and
	EDGE_TRUE_VALUE for the others.

gcc/testsuite/
	PR tree-optimization/68264
	* gcc.dg/torture/pr68264.c: New test.

From-SVN: r230323