[patch, libfortran] PR43298 Fortran library does not read in NaN -Inf or Inf

[Jerry DeLisle]

This attached patch adds code to read these special cases.  The code is self 
explanatory. This added feature is for formatted READ.

As a follow-up patch we can consider the contents of the parenthesis with NAN() 
and explicitly set the result. I will also be looking at how to handle signs.

Regression tested on x86-64. testing on other platforms would be appreciated.

OK for trunk?

Regards,

Jerry

2010-06-27  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	PR libfortran/43298
	* io/read.c: Add code to parse and read Inf, Infinity, NaN, and Nan with
	optional parenthesis.
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