PR fortran/29600

	* intrinsic.c (add_functions): Add optional KIND argument to ACHAR.
	* iresolve.c (gfc_resolve_achar): Handle the KIND argument.
	* check.c (gfc_check_achar): Check for the optional KIND argument.
	* simplify.c (gfc_simplify_achar): Use KIND argument.
	* intrinsic.h (gfc_check_achar, gfc_simplify_achar,
	gfc_resolve_achar): Adjust prototypes.

	* gfortran.dg/intrinsics_kind_argument_1.f90: Add test for ACHAR
	intrinsic.

From-SVN: r127385