[patch, fortran, committed] Change 1**k to 1

[Thomas Koenig]

Hello world,

the attached patch was committed after Tobias Burnus' OK
in PR 57073 and regression-testing.

	Thomas

2013-04-30  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/57071
         * frontend-passes.c (optimize_power):  Simplify
         1**k to 1.

2013-04-30  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/57071
         * gfortran.dg/power_5.f90:  New test.
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