Update prebuilt Clang to match Android kernel.

Bug: 132428451
Change-Id: I8f6e2cb23f381fc0c02ddea99b867e58e925e5be
diff --git a/linux-x64/clang/include/llvm/IR/Function.h b/linux-x64/clang/include/llvm/IR/Function.h
index 1b91537..7184cb4 100644
--- a/linux-x64/clang/include/llvm/IR/Function.h
+++ b/linux-x64/clang/include/llvm/IR/Function.h
@@ -1,9 +1,8 @@
 //===- llvm/Function.h - Class to represent a single function ---*- 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
 //
 //===----------------------------------------------------------------------===//
 //
@@ -158,7 +157,7 @@
   /// Returns the number of non-debug IR instructions in this function.
   /// This is equivalent to the sum of the sizes of each basic block contained
   /// within this function.
-  unsigned getInstructionCount();
+  unsigned getInstructionCount() const;
 
   /// Returns the FunctionType for me.
   FunctionType *getFunctionType() const {