* iso-fortran-env.def: Define INT8, INT16, INT32, INT64, REAL32,
	REAL64 and REAL128.
	* gfortran.h (gfc_get_int_kind_from_width_isofortranenv,
	gfc_get_real_kind_from_width_isofortranenv): New prototypes.
	* iso-c-binding.def: Update definitions for the INT*_T,
	INT_LEAST*_T and INT_FAST*_T named parameters.
	* trans-types.c (get_typenode_from_name, get_int_kind_from_name,
	gfc_get_real_kind_from_width_isofortranenv): New functions.

	* gfortran.dg/c_kind_int128_test1.f03: Also test C_INT_FAST128_T.
	* gfortran.dg/c_kind_int128_test2.f03: Update comment.
	* gfortran.dg/c_kind_params.f90: Also test int_fast*_t.
	* gfortran.dg/c_kinds.c: Add int_fast*_t arguments.

From-SVN: r147635