This patch from Chris Manghane changes the Go frontend to use the
backend interface for global declarations.  Bootstrapped and ran Go
testsuite on x86_64-unknown-linux-gnu.  Committed to mainline.

Ian


2014-04-25  Chris Manghane  <cmang@google.com>

	* go-gcc.cc: Include "cgraph.h" and "gimplify.h".
	(Gcc_backend::return_statement): Push and pop function.
	(Gcc_backend::label): Likewise.
	(Gcc_backend::function_defer_statement): Likewise.
	(Gcc_backend::switch_statement): Add function parameter.
	(Gcc_backend::block): Don't permit function to be NULL.
	(Gcc_backend::temporary_variable): Change go_assert to
	gcc_assert.
	(Gcc_backend::gc_root_variable): New function.
	(Gcc_backend::write_global_definitions): New function.