This gets rid of the DECL_STUBBED_P macro and adjusts Call_to_gnu.

Tested on x86_64-pc-linux-gnu, committed on trunk

gcc/ada/

	* gcc-interface/ada-tree.h (DECL_STUBBED_P): Delete.
	* gcc-interface/decl.c (gnat_to_gnu_entity): Do not set it.
	* gcc-interface/trans.c (Call_to_gnu): Use GNAT_NAME local variable
	and adjust accordingly.  Replace test on DECL_STUBBED_P with direct
	test on Convention and move it down in the processing.