cselim: Update the vop manually for cond_if_else_store replacement

cselim: Update the vop manually for cond_if_else_store replacement

To speed up things slightly, we can do the update of the vop for the
newly inserted store manually.
This will also allow a simplified part of cselim to be used inside
phi-opt to move the store out earlier and independent of the full cselim.

gcc/ChangeLog:

	* tree-ssa-phiopt.cc (cond_if_else_store_replacement_1): Add vphi argument.
	Manually update the vphi and new_stmt vdef/lhs.
	(cond_if_else_store_replacement): Update call to cond_if_else_store_replacement_1.

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