re PR rtl-optimization/12275 ([unit-at-a-time] ICE in htab_clear_slot)

re PR rtl-optimization/12275 ([unit-at-a-time] ICE in htab_clear_slot)

	PR opt/12275
	* c-decl.c (finish_decl): Use change_decl_assembler_name.
	* c-pragma.c (handle_pragma_redefine_extname): Likewise.
	* varasm.c (make_decl_rtl): Likewise.
	* cgraph.c (change_decl_assembler_name): New function.
	* tree.h (set_decl_assembler_name): Kill dead declaration.
	(change_decl_assembler_name): Declare.

	* decl.c (make_rtl_for_nonlocal_decl): Use change_decl_assembler_name.
	* decl2.c (make_rtl_for_nonlocal_decl): Use change_decl_assembler_name.

From-SVN: r73532