[PATCH] Add acosh, asinh, and atanh to intrinsics

[Jerry DeLisle]

This is a round 1 on this.

The attached patch adds acosh, asinh, and atanh intrinsic functions. 
The new file hyper.c provides wrapper functions for float versions.

I am not exactly clear on what must be done to "connect" 
libgfortran/intrinsics/hyper.c into the workings.  I edited configure.ac 
  to include the checks for the float versions, but do not know what 
else to do there.

Steve, I will incorporate your patch from:

http://gcc.gnu.org/ml/fortran/2005-06/txt00025.txt

In this patch if you wish.

I will develop test cases in round 2.

Comments will be much appreciated.

Regards,

Jerry
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