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/Demangle/Utility.h b/linux-x64/clang/include/llvm/Demangle/Utility.h
index ec23859..846a5f0 100644
--- a/linux-x64/clang/include/llvm/Demangle/Utility.h
+++ b/linux-x64/clang/include/llvm/Demangle/Utility.h
@@ -25,9 +25,9 @@
 // Stream that AST nodes write their string representation into after the AST
 // has been parsed.
 class OutputStream {
-  char *Buffer;
-  size_t CurrentPosition;
-  size_t BufferCapacity;
+  char *Buffer = nullptr;
+  size_t CurrentPosition = 0;
+  size_t BufferCapacity = 0;
 
   // Ensure there is at least n more positions in buffer.
   void grow(size_t N) {
@@ -52,7 +52,7 @@
     char *TempPtr = std::end(Temp);
 
     while (N) {
-      *--TempPtr = '0' + char(N % 10);
+      *--TempPtr = char('0' + N % 10);
       N /= 10;
     }
 
@@ -137,7 +137,7 @@
 
   char *getBuffer() { return Buffer; }
   char *getBufferEnd() { return Buffer + CurrentPosition - 1; }
-  size_t getBufferCapacity() { return BufferCapacity; }
+  size_t getBufferCapacity() const { return BufferCapacity; }
 };
 
 template <class T> class SwapAndRestore {