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/CodeGen/StackProtector.h b/linux-x64/clang/include/llvm/CodeGen/StackProtector.h
index 2bdf442..f6513e8 100644
--- a/linux-x64/clang/include/llvm/CodeGen/StackProtector.h
+++ b/linux-x64/clang/include/llvm/CodeGen/StackProtector.h
@@ -61,6 +61,12 @@
   /// protection when -fstack-protection is used.
   unsigned SSPBufferSize = 0;
 
+  /// VisitedPHIs - The set of PHI nodes visited when determining
+  /// if a variable's reference has been taken.  This set
+  /// is maintained to ensure we don't visit the same PHI node multiple
+  /// times.
+  SmallPtrSet<const PHINode *, 16> VisitedPHIs;
+
   // A prologue is generated.
   bool HasPrologue = false;
 
@@ -89,7 +95,7 @@
                                 bool InStruct = false) const;
 
   /// Check whether a stack allocation has its address taken.
-  bool HasAddressTaken(const Instruction *AI);
+  bool HasAddressTaken(const Instruction *AI, uint64_t AllocSize);
 
   /// RequiresStackProtector - Check whether or not this function needs a
   /// stack protector based upon the stack protector level.
@@ -98,9 +104,7 @@
 public:
   static char ID; // Pass identification, replacement for typeid.
 
-  StackProtector() : FunctionPass(ID), SSPBufferSize(8) {
-    initializeStackProtectorPass(*PassRegistry::getPassRegistry());
-  }
+  StackProtector();
 
   void getAnalysisUsage(AnalysisUsage &AU) const override;