gcc/go:
        PR go/89019
        * go-gcc.cc (Gcc_backend::placeholder_struct_type): Mark
        placeholder structs as requiring structural equality.
        (Gcc_backend::set_placeholder_pointer_type): Propagate the
	canonical type from the desired pointer type to the placeholder
	pointer type.
gcc/testsuite/:
        * lib/go-torture.exp: Test compiling with -flto.

From-SVN: r268572