Add "empty()" method to sys::Path and remove unnecessary whitespace.

Patch by Mikhail Glushenkov!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49803 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/System/Path.h

@@ -290,6 +290,9 @@ namespace sys {
       /// size - Return the length in bytes of this path name.
       unsigned size() const { return path.size(); }
 
+      /// empty - Returns true if the path is empty.
+      unsigned empty() const { return path.empty(); }
+
     /// @}
     /// @name Disk Accessors
     /// @{