ifcvt: Fix force_operand ICE in noce_convert_multiple_sets [PR116353]

ifcvt: Fix force_operand ICE in noce_convert_multiple_sets [PR116353]

Now that more operations are allowed for noce_convert_multiple_sets,
we need to check noce_can_force_operand on the sequence before calling
try_emit_cmove_seq.  Otherwise an inappropriate argument may be given
to copy_to_mode_reg and result in an ICE.

	PR tree-optimization/116353

gcc/ChangeLog:

	* ifcvt.cc (bb_ok_for_noce_convert_multiple_sets): Check
	noce_can_force_operand.

gcc/testsuite/ChangeLog:

	* gcc.target/i386/pr116353.c: New test.