Fortran: implement F2018 intrinsic OUT_OF_RANGE [PR115788]

Implementation of the Fortran 2018 standard intrinsic OUT_OF_RANGE, with
the GNU Fortran extension to unsigned integers.

Runtime code is fully inline expanded.

	PR fortran/115788

gcc/fortran/ChangeLog:

	* check.cc (gfc_check_out_of_range): Check arguments to intrinsic.
	* expr.cc (free_expr0): Fix a memleak with unsigned literals.
	* gfortran.h (enum gfc_isym_id): Define GFC_ISYM_OUT_OF_RANGE.
	* gfortran.texi: Add OUT_OF_RANGE to list of intrinsics supporting
	UNSIGNED.
	* intrinsic.cc (add_functions): Add Fortran prototype.  Break some
	nearby lines with excessive length.
	* intrinsic.h (gfc_check_out_of_range): Add prototypes.
	* intrinsic.texi: Fortran documentation of OUT_OF_RANGE.
	* simplify.cc (gfc_simplify_out_of_range): Compile-time simplification
	of OUT_OF_RANGE.
	* trans-intrinsic.cc (gfc_conv_intrinsic_out_of_range): Generate
	inline expansion of runtime code for OUT_OF_RANGE.
	(gfc_conv_intrinsic_function): Use it.

gcc/testsuite/ChangeLog:

	* gfortran.dg/ieee/out_of_range.f90: New test.
	* gfortran.dg/out_of_range_1.f90: New test.
	* gfortran.dg/out_of_range_2.f90: New test.
	* gfortran.dg/out_of_range_3.f90: New test.