tree-nrv.c (dest_safe_for_nrv_p): Grok any handled_component_p, SSA_NAMEs, RESULT_DECLs and PARM_DECLs.

	* tree-nrv.c (dest_safe_for_nrv_p): Grok any handled_component_p,
	SSA_NAMEs, RESULT_DECLs and PARM_DECLs.

	* g++.dg/opt/nrv12.C: New test.
	* gcc.target/i386/nrv1.c: New test.

From-SVN: r126200