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/Support/MD5.h b/linux-x64/clang/include/llvm/Support/MD5.h
index bb2bdbf..3b2d5b9 100644
--- a/linux-x64/clang/include/llvm/Support/MD5.h
+++ b/linux-x64/clang/include/llvm/Support/MD5.h
@@ -28,7 +28,6 @@
 #ifndef LLVM_SUPPORT_MD5_H
 #define LLVM_SUPPORT_MD5_H
 
-#include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/Endian.h"
 #include <array>
@@ -36,6 +35,7 @@
 
 namespace llvm {
 
+template <unsigned N> class SmallString;
 template <typename T> class ArrayRef;
 
 class MD5 {