[patch, fortran] Fix PR 85387

[Thomas König]

Hello world,

the attached patch fixes the PR, an 8 regression caused by
trying to convert a nested implied DO loop to an array
for a case where this was not possible.

Regression-tested. OK for trunk?

Regards

	Thomas

2018-04-14  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/85387
	* frontend-passes.c (traverse_io_block): Check for start, end or
	stride being defined by an outer implied DO loop.

2018-04-14  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/85387
	* gfortran.dg/implied_do_io_5.f90: New test.
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