Merge pull request #1929 from danra/identifier_notequals_dry2

Prettier operator!= DRY

Author: gribozavr

include/swift/AST/Identifier.h

@@ -143,7 +143,7 @@ class Identifier {
   int compare(Identifier other) const;
 
   bool operator==(Identifier RHS) const { return Pointer == RHS.Pointer; }
-  bool operator!=(Identifier RHS) const { return !operator==(RHS); }
+  bool operator!=(Identifier RHS) const { return !(*this==RHS); }
 
   bool operator<(Identifier RHS) const { return Pointer < RHS.Pointer; }
 
@@ -367,7 +367,7 @@ class DeclName {
   }
 
   friend bool operator!=(DeclName lhs, DeclName rhs) {
-    return !operator==(lhs, rhs);
+    return !(lhs == rhs);
   }
 
   friend bool operator<(DeclName lhs, DeclName rhs) {
@@ -481,7 +481,7 @@ class ObjCSelector {
   }
 
   friend bool operator!=(ObjCSelector lhs, ObjCSelector rhs) {
-    return !operator==(lhs, rhs);
+    return !(lhs == rhs);
   }
 
   friend bool operator<(ObjCSelector lhs, ObjCSelector rhs) {