[patch, testsuite] Add new check for large reals to support float128 tests in gfortran.dg

[Jerry DeLisle]

Hi,

The attached patch, introduced to me by Tobias Burnus, adds a check for large 
real kinds.

This allows the new test case for NANs to be added to the gfortran.dg testsuite.

I have been running this in my tree for some time with the nan test case 
(x86-64).  I would appreciate testing on other platforms.

OK for trunk?

Jerry

2011-02-18  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	* lib/target-supports.exp (check_effective_target_fortran_large_real)
	New check for large reals.
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