When generating code for a non-nested delegate literal, there is no
context pointer required to pass to the function.

2019-03-09  Iain Buclaw  <ibuclaw@gdcproject.org>

gcc/d/
	PR d/89041
	* d-codegen.cc (get_frame_for_symbol): Delegate literals defined in
	global scope don't have a frame pointer.

gcc/testsuite/
	PR d/89041
	* gdc.dg/pr89041.d: New test.

From-SVN: r269533