Fix size recalculation of fortran arrays

Fix size recalculation of fortran arrays

My recent change regarding size calculation of arrays of stubbed types
didn't take array strides and associated/allocated type properties into
account, which basically broke fortran arrays.

Fixed by refactoring the array size calculation of
create_array_type_with_stride into a new function, and also use it for
the stubbed array size recalculation.

gdb/ChangeLog:

2020-05-01  Hannes Domani  <ssbssa@yahoo.de>

	* gdbtypes.c (update_static_array_size): New function.
	(create_array_type_with_stride): Use update_static_array_size.
	(check_typedef): Likewise.