[Committed] fortra/50821 -- fix regression in ishft[c]

[Steve Kargl]

I've committed the attached patch to address a
regression caused by my recent change to argument
checking in ISHFT[C].  Both my regression test
and Dominiq's regression test passed.  Sorry 
about the breakage.

2011-10-20  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/50821
	* check.c (gfc_check_ishftc): Check args are constant before 
	extracting the integer.

-- 
Steve
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