Update prebuilt Clang to r416183b from Android.

https://android.googlesource.com/platform/prebuilts/clang/host/
linux-x86/+/06a71ddac05c22edb2d10b590e1769b3f8619bef

clang 12.0.5 (based on r416183b) from build 7284624.

Change-Id: I277a316abcf47307562d8b748b84870f31a72866
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/linux-x64/clang/include/llvm/ExecutionEngine/ObjectCache.h b/linux-x64/clang/include/llvm/ExecutionEngine/ObjectCache.h
index 47e94f1..1c72ca3 100644
--- a/linux-x64/clang/include/llvm/ExecutionEngine/ObjectCache.h
+++ b/linux-x64/clang/include/llvm/ExecutionEngine/ObjectCache.h
@@ -9,11 +9,12 @@
 #ifndef LLVM_EXECUTIONENGINE_OBJECTCACHE_H
 #define LLVM_EXECUTIONENGINE_OBJECTCACHE_H
 
-#include "llvm/Support/MemoryBuffer.h"
 #include <memory>
 
 namespace llvm {
 
+class MemoryBuffer;
+class MemoryBufferRef;
 class Module;
 
 /// This is the base ObjectCache type which can be provided to an