Fortran : ICE in gfc_validate_kind PR95586

Fortran  :  ICE in gfc_validate_kind PR95586

Report syntax error for invalid letter-spec in IMPLICIT statements
for derived types and not an ICE.

Original patch by Steve Kargl.  Added test cases based on those
provided by G. Steinmetz  in the PR.

2020-06-23  Steven G. Kargl  <kargl@gcc.gnu.org>

gcc/fortran/

	PR fortran/95586
	* decl.c (gfc_match_implicit): Only perform else branch if
	the type spect is not BT_DERIVED.

2020-06-23  Mark Eggleston  <markeggleston@gcc.gnu.org>

gcc/testsuite/

	PR fortran/95586
	* gfortran.dg/pr95586_1.f90: New test.
	* gfortran.dg/pr95586_2.f90: New test.