gimple.h (gimple_call_set_chain): Accept SSA variables.

	* gimple.h (gimple_call_set_chain): Accept SSA variables.
	* tree-ssa-pre.c (create_component_ref_by_pieces_1) <CALL_EXPR>:
	Rematerialize the static chain, if any.
	* tree-ssa-sccvn.c (copy_reference_ops_from_call): Also copy the
	static chain.

From-SVN: r139072