[PATCH] Make the _gfortran_pow* const

[Andrew Pinski]

Hi,
  This patch makes the _gfortran_pow* function constant functions as the
return value is only dependent on those values and they don't have any
special side effects.

This patch speeds up my father's code by about 10% where he has a couple
of rd**3.

OK? Bootstrapped and tested on i686-linux-gnu with no regressions.

Thanks,
Andrew Pinski

ChangeLog:

	* trans-decl.c (gfc_build_intrinsic_function_decls): Mark the
	pow functions as constant functions.
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