Update prebuilt Clang to match Android kernel.

Bug: 132428451
Change-Id: I8f6e2cb23f381fc0c02ddea99b867e58e925e5be
diff --git a/linux-x64/clang/include/llvm/MC/MCDwarf.h b/linux-x64/clang/include/llvm/MC/MCDwarf.h
index 2bfaf19..8eaa152 100644
--- a/linux-x64/clang/include/llvm/MC/MCDwarf.h
+++ b/linux-x64/clang/include/llvm/MC/MCDwarf.h
@@ -1,9 +1,8 @@
 //===- MCDwarf.h - Machine Code Dwarf support -------------------*- 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
 //
 //===----------------------------------------------------------------------===//
 //
@@ -430,6 +429,7 @@
     OpUndefined,
     OpRegister,
     OpWindowSave,
+    OpNegateRAState,
     OpGnuArgsSize
   };
 
@@ -509,6 +509,11 @@
     return MCCFIInstruction(OpWindowSave, L, 0, 0, "");
   }
 
+  /// .cfi_negate_ra_state AArch64 negate RA state.
+  static MCCFIInstruction createNegateRAState(MCSymbol *L) {
+    return MCCFIInstruction(OpNegateRAState, L, 0, 0, "");
+  }
+
   /// .cfi_restore says that the rule for Register is now the same as it
   /// was at the beginning of the function, after all initial instructions added
   /// by .cfi_startproc were executed.
@@ -593,6 +598,7 @@
   bool IsSignalFrame = false;
   bool IsSimple = false;
   unsigned RAReg = static_cast<unsigned>(INT_MAX);
+  bool IsBKeyFrame = false;
 };
 
 class MCDwarfFrameEmitter {