[APFloat] Added support for parsing float strings which contain {inf,-inf,NaN,-NaN}.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184713 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/ADT/APFloat.h

@@ -510,6 +510,7 @@ private:
   /// \name Miscellany
   /// @{
 
+  bool convertFromStringSpecials(StringRef str);
   opStatus normalize(roundingMode, lostFraction);
   opStatus addOrSubtract(const APFloat &, roundingMode, bool subtract);
   cmpResult compareAbsoluteValue(const APFloat &) const;