[MsgPack] Added a convenience operator

[dineshkb-amd]

Summary

Added a convenience operator

[dineshkb-amd]

Ran clang-format

[scott.linder]

LGTM, thanks!

[saiislam]

Does it make sense to add a test case for it?

[dineshkb-amd]

Rebased the changes.

[dineshkb-amd]

Added test case

[dineshkb-amd]

In D81142#2074351, @saiislam wrote:

Does it make sense to add a test case for it?

Done

[dineshkb-amd]

Moved to a different user name.

llvm/include/llvm/BinaryFormat/MsgPackDocument.h

 //===-- MsgPackDocument.h - MsgPack Document --------------------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 ///
friend bool operator<(const DocNode &Lhs, const DocNode &Rhs) {
     }
   }
 
   /// Equality operator
   friend bool operator==(const DocNode &Lhs, const DocNode &Rhs) {
     return !(Lhs < Rhs) && !(Rhs < Lhs);
   }
 
+  /// Inequality operator
+  friend bool operator!=(const DocNode &Lhs, const DocNode &Rhs) {
+    return !(Lhs == Rhs);
+  }
+
   /// Convert this node to a string, assuming it is scalar.
   std::string toString() const;
 
   /// Convert the StringRef and use it to set this DocNode (assuming scalar). If
   /// it is a string, copy the string into the Document's strings list so we do
   /// not rely on S having a lifetime beyond this call. Tag is "" or a YAML tag.
   StringRef fromString(StringRef S, StringRef Tag = "");