[PATCH,Fortran] -- Check for overflow integer exponentation

[Steve Kargl]

I have had this patch in my tree since the beginning of May.  
During constant folding, gfortran would not issue an error
for overflow for integer exponentation.  Bootstrapped 
and regression tested multiple times on x86_64-*-freebsd?
OK to commit?

2019-06-15  Steven G. Kargl  <kargl@gcc.gnu.org>

	* arith.c (arith_power): Rework overflow of an integer to an integer
	exponent.

2019-06-15  Steven G. Kargl  <kargl@gcc.gnu.org>

	* gfortran.dg/integer_exponentiation_4.f90: Update test.
	* gfortran.dg/integer_exponentiation_5.F90: Ditto.
	* gfortran.dg/no_range_check_1.f90: Ditto.

-- 
Steve
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