* config/ia64/ia64.c: Include libfuncs.h.
	(TARGET_PROMOTE_FUNCITON_MODE): Define target macro.
	(ia64_expand_call): Use reg 25 on VMS.
	(ia64_initialize_trampoline): Fix for VMS ABI.
	(ia64_function_arg_offset): Always returns 0 when TARGET_ABI_OPEN_VMS.
	(ia64_function_arg): Initialize reg 25 on VMS.
	Fix OpenVMS ABI issues for varargs.
	For OpenVMS, emit the Argument Information register set in the
	incoming/sibcall case as well.
	(ia64_arg_type): New function.
	(ia64_function_arg_advance): Keep track of cum->words.
	Fix OpenVMS ABI issues for varargs.
	(ia64_function_value): On VMS, promote mode of non-aggregate types.
	(ia64_override_options): Set flag_no_common on VMS.
	(ia64_init_builtins): Disable FWRITE builtin.
	(ia64_asm_output_external): Call DO_CRTL_NAMES.
	(ia64_vms_init_libfuncs): Add decc$ routines.
	(ia64_vms_valid_pointer_mode): New function.
	(ia64_struct_value_rtx): Allways NULL_RTX on VMS.
	(ia64_promote_function_mode): New function
	* config/ia64/ia64.h (TARGET_ABI_OPEN_VMS): Define as 0 for default.
	(LONG_DOUBLE_TYPE_SIZE): Force to 64 on VMS.
	(LIBCGC2_LONG_DOUBLE_TYPE_SIZE): Likewise.
	(INIT_CUMULATIVE_ARGS): Add atypes for VMS.
	(INIT_CUMULATIVE_INCOMING_ARGS): Likewise.
	(ASM_OUTPUT_DEF): Use ISDIGIT instead of isdigit.
	Suppress trailing '#' if VALUE is numeric.
	* config/ia64/vms.h (PROMOTE_FUNCTION_MODE): Remove, code moved to
	ia64_promote_function_mode.
	(TARGET_VALID_POINTER_MODE): Define.


Co-Authored-By: Olivier Hainque <hainque@adacore.com>

From-SVN: r151009