[fortran,patch] Add simplifiers for ISNAN and IS_IOSTAT_{END,EOR}

[FX]

Attached patch simply does what it says in the subject. Not very  
exciting, but required by the standard because the IS_IOSTAT_*  
functions are allowed in initialization expressions (ISNAN is a GNU  
extension).

Bootstrapped and regtested on i686-darwin, comes with testcases. OK to  
commit?


FX


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