CCP: Manually rename the virtual mem op when inserting clobbers

CCP: Manually rename the virtual mem op when inserting clobbers

Right now the only place where CCP needs to have the virtual op renamed is
after inserting clobbers which come right before __builtin_stack_restore.
So let's manually do the correct thing so we can remove the TODO_update_ssa todo.

gcc/ChangeLog:

	* tree-ssa-ccp.cc (insert_clobber_before_stack_restore): Update the virtual
	op on the inserted clobber and the stack restore function.
	(do_ssa_ccp): Don't add TODO_update_ssa to the todo.

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