[Patch, fortran] Simplify lbound for array subcomponents

[Mikael Morin]

Hello,

while reviewing Thomas' bound simplification patch, I noticed that the
{l,u}bound simplification code wasn't handling array subcomponents.
Fixed by the attached patch, regression tested.  OK for trunk?

Mikael





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2015-04-27  Mikael Morin  <mikael@gcc.gnu.org>

	* 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.

2015-04-27  Mikael Morin  <mikael@gcc.gnu.org>

	* gfortran.dg/bound_simplify_4.f90: New.

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