Update prebuilt Clang to match Android kernel.

Bug: 132428451
Change-Id: I8f6e2cb23f381fc0c02ddea99b867e58e925e5be
diff --git a/linux-x64/clang/include/llvm/IR/Constant.h b/linux-x64/clang/include/llvm/IR/Constant.h
index 5fdf0ea..e71ac27 100644
--- a/linux-x64/clang/include/llvm/IR/Constant.h
+++ b/linux-x64/clang/include/llvm/IR/Constant.h
@@ -1,9 +1,8 @@
 //===-- llvm/Constant.h - Constant class definition -------------*- 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
 //
 //===----------------------------------------------------------------------===//
 //
@@ -114,7 +113,8 @@
 
   /// For aggregates (struct/array/vector) return the constant that corresponds
   /// to the specified element if possible, or null if not. This can return null
-  /// if the element index is a ConstantExpr, or if 'this' is a constant expr.
+  /// if the element index is a ConstantExpr, if 'this' is a constant expr or
+  /// if the constant does not fit into an uint64_t.
   Constant *getAggregateElement(unsigned Elt) const;
   Constant *getAggregateElement(Constant *Elt) const;