[PATCH, fortran] Fix a few PRs.

[Jerry DeLisle]

Steve Kargl wrote:
> 2007-11-28  Steven G. Kargl  <kargls@comcast.net>
> 
> 	PR fortran/34230
> 	* fortran/arith.c (gfc_check_real_range): Set intermediate values
> 	to +-Inf and 0 when -fno-range-check is in effect.
> 	* gfortran.dg/real_const_3.f90: Fix up for new range-check handling.
> 
> 	* fortran/invoke.texi: Document the C escaped characters activated
> 	by -fbackslash.  Improve -fno-range-check description.
> 
> 	PR libfortran/33583
> 	* libgfortran/gfortran.map: Add tgammaf.
> 	* gfortran.dg/gamma_5.f90: Remove xfail.
> 
> 
Looks OK, I will commit for you.

Jerry