Update prebuilt Clang to r365631c1 from Android.

The version we had was segfaulting.

Bug: 132420445
Change-Id: Icb45a6fe0b4e2166f7895e669df1157cec9fb4e0
diff --git a/linux-x64/clang/include/llvm/ADT/DenseMap.h b/linux-x64/clang/include/llvm/ADT/DenseMap.h
index e7cd370..a05cf81 100644
--- a/linux-x64/clang/include/llvm/ADT/DenseMap.h
+++ b/linux-x64/clang/include/llvm/ADT/DenseMap.h
@@ -63,7 +63,7 @@
   template <typename AltPairT>
   DenseMapPair(AltPairT &&AltPair,
                typename std::enable_if<std::is_convertible<
-                   AltPairT, std::pair<KeyT, ValueT>>::value>::type * = 0)
+                   AltPairT, std::pair<KeyT, ValueT>>::value>::type * = nullptr)
       : std::pair<KeyT, ValueT>(std::forward<AltPairT>(AltPair)) {}
 
   KeyT &getFirst() { return std::pair<KeyT, ValueT>::first; }