mergephi: extend copy_phi_arg_into_existing_phi and use it for remove_forwarder_block_with_phi

copy_phi_arg_into_existing_phi was added in r14-477-g78b0eea7802698
and used in remove_forwarder_block but since
remove_forwarder_block_with_phi needed to use the redirect edge var
map, it was not moved over. This extends copy_phi_arg_into_existing_phi
to have the ability to optional use the mapper.

This also makes remove_forwarder_block_with_phi and remove_forwarder_block closer to
one another. There is a few other changes needed to be able to do both
from the same function.

Bootstrapped and tested on x86_64-linux-gnu.

gcc/ChangeLog:

	* tree-cfg.cc (copy_phi_arg_into_existing_phi): New use_map argument.
	* tree-cfg.h (copy_phi_arg_into_existing_phi): Update declaration.
	* tree-cfgcleanup.cc (remove_forwarder_block_with_phi): Use
	copy_phi_arg_into_existing_phi instead of inlining it.

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

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