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/Support/Parallel.h b/linux-x64/clang/include/llvm/Support/Parallel.h
index 9843b95..eab9b49 100644
--- a/linux-x64/clang/include/llvm/Support/Parallel.h
+++ b/linux-x64/clang/include/llvm/Support/Parallel.h
@@ -73,8 +73,12 @@
 
 class TaskGroup {
   Latch L;
+  bool Parallel;
 
 public:
+  TaskGroup();
+  ~TaskGroup();
+
   void spawn(std::function<void()> f);
 
   void sync() const { L.sync(); }