alpha.c (alpha_return_in_memory): On VMS...

alpha.c (alpha_return_in_memory): On VMS...

	* config/alpha/alpha.c (alpha_return_in_memory): On VMS, ensure
	that records that fit in 64 bits are returned by immediate value,
	as required by OpenVMS Calling Standard.
	(function_value): Adjust for above modification.
	(alpha_va_start) <TARGET_ABI_OPEN_VMS>: Use
	virtual_incoming_args_rtx as base object, not next_arg.
	* config/alpha/vms.h: (DEFAULT_PCC_STRUCT_RETURN): Define as 0.

Co-Authored-By: Douglas B Rupp <rupp@gnat.com>
Co-Authored-By: Eric Botcazou <ebotcazou@adacore.com>
From-SVN: r150652