[PATCH,fortran] Add support for IEEE_SUBNORMAL

[Steve Kargl]

Fortran 2018 has added IEEE_SUBNORMAL, IEEE_POSITIVE_SUBNORMAL, and
IEEE_NEGATIVE_SUBNORMAL as counterparts the same features with the
DENORMAL name.  The attached patch allows gfortran to recognize
and do the right thing with these featuers.  OK to commit?

2018-12-25  Steven G. Kargl  <kargl@gcc.gnu.org>

	* expr.c (external_spec_function): Add ieee_support_subnormal to list
	of IEEE inquiry functions.


2018-12-25  Steven G. Kargl  <kargl@gcc.gnu.org>
	* gfortran.map: Expose subnormal functions in dynamic
	library.
	* ieee/ieee_arithmetic.F90: Add support for IEEE_SUBNORMAL,
	IEEE_POSITIVE_SUBNORMAL, and IEEE_NEGATIVE_SUBNORMAL.
	* ieee/ieee_helper.c: Ditto.
	* ieee/ieee_features.F90:  Add IEEE_SUBNORMAL.

-- 
Steve
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