Update prebuilt Clang to match Android kernel.

Bug: 132428451
Change-Id: I8f6e2cb23f381fc0c02ddea99b867e58e925e5be
diff --git a/linux-x64/clang/include/llvm/IR/MDBuilder.h b/linux-x64/clang/include/llvm/IR/MDBuilder.h
index 174616c..3a2b1bd 100644
--- a/linux-x64/clang/include/llvm/IR/MDBuilder.h
+++ b/linux-x64/clang/include/llvm/IR/MDBuilder.h
@@ -1,9 +1,8 @@
 //===---- llvm/MDBuilder.h - Builder for LLVM metadata ----------*- C++ -*-===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// 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
 //
 //===----------------------------------------------------------------------===//
 //
@@ -95,6 +94,17 @@
   MDNode *createCallees(ArrayRef<Function *> Callees);
 
   //===------------------------------------------------------------------===//
+  // Callback metadata.
+  //===------------------------------------------------------------------===//
+
+  /// Return metadata describing a callback (see llvm::AbstractCallSite).
+  MDNode *createCallbackEncoding(unsigned CalleeArgNo, ArrayRef<int> Arguments,
+                                 bool VarArgsArePassed);
+
+  /// Merge the new callback encoding \p NewCB into \p ExistingCallbacks.
+  MDNode *mergeCallbackEncodings(MDNode *ExistingCallbacks, MDNode *NewCB);
+
+  //===------------------------------------------------------------------===//
   // AA metadata.
   //===------------------------------------------------------------------===//