* module.c (gfc_use_module): Uncomment the ISO_FORTRAN_ENV code.

	* module.c (gfc_use_module): Uncomment the ISO_FORTRAN_ENV code.
	Check that intrinsic and non-intrinsic modules don't conflict.
	(use_iso_fortran_env_module): New function.
	(create_int_parameter): New function.
	* trans-types.c (gfc_init_kinds): Choose values for
	gfc_numeric_storage_size and gfc_character_storage_size.
	(gfc_numeric_storage_size, gfc_character_storage_size): New variables.
	* resolve.c (resolve_symbol): Do no check intrinsic modules
	against the list of intrinsic symbols.
	* iso-fortran-env.def: New file.
	* gfortran.h (gfc_numeric_storage_size,
	gfc_character_storage_size): Add prototypes.

	* gfortran.dg/use_3.f90: Remove error message.
	* gfortran.dg/iso_fortran_env_1.f90: New test.
	* gfortran.dg/iso_fortran_env_2.f90: New test.
	* gfortran.dg/iso_fortran_env_3.f90: New test.
	* gfortran.dg/iso_fortran_env_4.f90: New test.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@118998 138bc75d-0d04-0410-961f-82ee72b054a4