middle-end/70090: Register __bdos for sanitizers if necessary

middle-end/70090: Register __bdos for sanitizers if necessary

The asan initializer registers __builtin_object_size for languages that
don't have it, e.g. Fortran.  Register __builtin_dynamic_object_size too
(we need both because __builtin_dynamic_object_size computation may
involve generating __builtin_object_size as a fallback) so that
gfortran.dg/ubsan/bind-c-intent-out-2.f90 does not crash anymore.

gcc/ChangeLog:

	PR middle-end/70090
	* asan.cc (initialize_sanitizer_builtins): Register
	__builtin_dynamic_object_size if necessary.

Signed-off-by: Siddhesh Poyarekar <siddhesh@gotplt.org>