ifcvt: fix factor_out_operators (again) [PR121695]

r16-2648-gaebbc90d8c7c70 had a copy and pasto where
the second statement was supposed to be setting
the operand 1 of the phi but it was setting operand 0 instead.
This fixes typo.

Push as obvious after a quick build test for x86_64-linux-gnu.

	PR tree-optimization/121695

gcc/ChangeLog:

	* tree-if-conv.cc (factor_out_operators): Fix typo
	in assignment of the phi.

gcc/testsuite/ChangeLog:

	* gcc.dg/torture/pr121695-1.c: New test.

Signed-off-by: Andrew Pinski <andrew.pinski@oss.qualcomm.com>
2 files changed