elfos.h (ASM_DECLARE_OBJECT_NAME): Use decl size instead of type size.

gcc/
	* config/elfos.h (ASM_DECLARE_OBJECT_NAME): Use decl size
	instead of type size.
	(ASM_FINISH_DECLARE_OBJECT): Likewise.

gcc/testsuite/
	* gcc.target/i386/struct-size.c: New.

From-SVN: r213699