cmath: Fix typo in comment.

2015-08-19  Paolo Carlini  <paolo.carlini@oracle.com>

	* include/c_global/cmath: Fix typo in comment.

From-SVN: r227007

libstdc++-v3/ChangeLog

 2015-08-19  Paolo Carlini  <paolo.carlini@oracle.com>
 
+	* include/c_global/cmath: Fix typo in comment.
+
+2015-08-19  Paolo Carlini  <paolo.carlini@oracle.com>
+
 	* include/c_global/cmath: Revert fix for libstdc++/58625, no
 	longer necessary (__builtin_signbit is now type-generic).
 

libstdc++-v3/include/c_global/cmath

@@ -650,7 +650,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     isnormal(_Tp __x)
     { return __x != 0 ? true : false; }
 
-  // Note: c++/36757 is fixed, __builtin_signbit is type-generic.
+  // Note: middle-end/36757 is fixed, __builtin_signbit is type-generic.
   constexpr bool
   signbit(float __x)
   { return __builtin_signbit(__x); }