[Committed] Fix PR tree-opt/26179, ICE in create_component_ref_by_pieces

[Andrew Pinski]

The problem here is that create_component_ref_by_pieces in
tree-ssa-pre.c forgot to handle RETURN_DECL so we get an
ICE.  Since RETURN_DECL is just like any other decl,
I committed the following patch as obvious that makes
create_component_ref_by_pieces handles RETURN_DECL in
the same maner as the rest of the decls.

Committed as obvious after a bootstrap/test.

Thanks,
Andrew Pinski

ChangeLog:


	* tree-ssa-pre.c (create_component_ref_by_pieces): 
	Handle RETURN_DECL like VAR_DECL.

	* g++.dg/opt/pr26179.C: New test.
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