VN: Don't recurse on for the same value of `a | b` [PR117496]

VN: Don't recurse on for the same value of `a | b` [PR117496]

After adding vn_valueize to the handle the `a | b ==/!= 0` case
of insert_predicates_for_cond, it would go into an infinite loop
as the Value number for either a or b could be the same as what it
is for the whole expression. This avoids that recursion so there is
no infinite loop here.

Bootstrapped and tested on x86_64-linux.

	PR tree-optimization/117496

gcc/ChangeLog:

	* tree-ssa-sccvn.cc (insert_predicates_for_cond): If the
	valueization for the new lhs is the same as the old one,
	don't recurse.

gcc/testsuite/ChangeLog:

	* gcc.dg/torture/pr117496-1.c: New test.

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