[patch, committed] Fix PR 84640

[Thomas Koenig]

Hi,

I just committed the fix below as obvious and simple. No test case
because the problem was only visible in with an instrumented
compiler.

Regards

	Thomas

  2018-10-06  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/84640
	* simplify.c (gfc_simplify_cshift): Extend size of hs_ex and ss_ex
	by one. Set extents one past the array boundaries to zero to avoid
	warning with instrumented compiler.
	(gfc_simplify_eoshift): Likewise, only for ss_ex.
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