fold-const: Fix up CLZ handling in tree_call_nonnegative_warnv_p [PR115337]

fold-const: Fix up CLZ handling in tree_call_nonnegative_warnv_p [PR115337]

The function currently incorrectly assumes all the __builtin_clz* and .CLZ
calls have non-negative result.  That is the case of the former which is UB
on zero and has [0, prec-1] return value otherwise, and is the case of the
single argument .CLZ as well (again, UB on zero), but for two argument
.CLZ is the case only if the second argument is also nonnegative (or if we
know the argument can't be zero, but let's do that just in the ranger IMHO).

The following patch does that.

2024-06-04  Jakub Jelinek  <jakub@redhat.com>

	PR tree-optimization/115337
	* fold-const.cc (tree_call_nonnegative_warnv_p) <CASE_CFN_CLZ>:
	If fn is CFN_CLZ, use CLZ_DEFINED_VALUE_AT.

(cherry picked from commit b82a816000791e7a286c7836b3a473ec0e2a577b)