[patch, fortran, committed] Fix PR 83650 on gcc-7

[Thomas Koenig]

Hello world,

I have committed the patch below as obvious to fix the
same bug on gcc-7 that my recent patch fixed on trunk.


2018-01-02  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/83650
	* simplify.c (gfc_simplify_cshift): Correct contition for
	negative shifts.

2018-01-02  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/83650
	* gfortran.dg/simplify_cshift_1.f90: Correct condition.

Regards

	Thomas
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