Update prebuilt Clang to match Android kernel.

Bug: 132428451
Change-Id: I8f6e2cb23f381fc0c02ddea99b867e58e925e5be
diff --git a/linux-x64/clang/include/llvm/ADT/IntervalMap.h b/linux-x64/clang/include/llvm/ADT/IntervalMap.h
index b75c492..12828c4 100644
--- a/linux-x64/clang/include/llvm/ADT/IntervalMap.h
+++ b/linux-x64/clang/include/llvm/ADT/IntervalMap.h
@@ -1,9 +1,8 @@
 //===- llvm/ADT/IntervalMap.h - A sorted interval map -----------*- 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
 //
 //===----------------------------------------------------------------------===//
 //
@@ -1134,6 +1133,19 @@
     I.find(x);
     return I;
   }
+
+  /// overlaps(a, b) - Return true if the intervals in this map overlap with the
+  /// interval [a;b].
+  bool overlaps(KeyT a, KeyT b) {
+    assert(Traits::nonEmpty(a, b));
+    const_iterator I = find(a);
+    if (!I.valid())
+      return false;
+    // [a;b] and [x;y] overlap iff x<=b and a<=y. The find() call guarantees the
+    // second part (y = find(a).stop()), so it is sufficient to check the first
+    // one.
+    return !Traits::stopLess(b, I.start());
+  }
 };
 
 /// treeSafeLookup - Return the mapped value at x or NotFound, assuming a