Fix 61441 [3/5] Remove flag_errno_math check for RINT

[Saraswati, Sujoy (OSTL)]

Hi,
 This patch removes flag_errno_math check for RINT, treating it similar to 
nearbyint.  
Regards,
Sujoy

  2015-11-26  Sujoy Saraswati <sujoy.sarasw...@hpe.com>
    
            PR tree-optimization/61441
            * match.pd (f(x) -> x): Removed flag_errno_math check for RINT.

Index: gcc/match.pd
===================================================================
--- gcc/match.pd        (revision 230851)
+++ gcc/match.pd        (working copy)
@@ -2565,16 +2565,10 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
   (fns (fns @0))
   (fns @0)))
 /* f(x) -> x if x is integer valued and f does nothing for such values.  */
-(for fns (TRUNC FLOOR CEIL ROUND NEARBYINT)
+(for fns (TRUNC FLOOR CEIL ROUND NEARBYINT RINT)
  (simplify
   (fns integer_valued_real_p@0)
   @0))
-/* Same for rint.  We have to check flag_errno_math because
-   integer_valued_real_p accepts +Inf, -Inf and NaNs as integers.  */
-(if (!flag_errno_math)
- (simplify
-  (RINT integer_valued_real_p@0)
-  @0))

 /* hypot(x,0) and hypot(0,x) -> abs(x).  */
 (simplify