Allow bound simplification of array subreferences.

Allow bound simplification of array subreferences.

gcc/fortran/
	* simplify.c (simplify_bound_dim): Tighten the check for array fullness
	by also checking for absence of subreference.
	(simplify_bound): Don't skip simplification if the array
	has subreferences.
	(simplify_cobound): Same.
gcc/testsuite/
	* gfortran.dg/bound_simplification_4.f90: New.

From-SVN: r222681