d: Return promoted types in d_type_promotes_to when linkage is not D

d: Return promoted types in d_type_promotes_to when linkage is not D

This enables warnings to be shown when a bad type is passed to va_arg
inside an extern(C) or extern(C++) function.

gcc/d/ChangeLog:

	PR d/97002
	* d-codegen.cc (d_build_call): Set input_location on CALL_EXPR.
	* d-lang.cc: Include function.h.
	(d_type_promotes_to): Do default conversions for C and C++ functions.
	* intrinsics.cc (expand_intrinsic_vaarg): Use build1_loc to build
	VA_ARG_EXPR.

gcc/testsuite/ChangeLog:

	PR d/97002
	* gdc.dg/pr97002.d: New test.