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/Analysis/InstructionPrecedenceTracking.h b/linux-x64/clang/include/llvm/Analysis/InstructionPrecedenceTracking.h
index 3c39810..46bc974 100644
--- a/linux-x64/clang/include/llvm/Analysis/InstructionPrecedenceTracking.h
+++ b/linux-x64/clang/include/llvm/Analysis/InstructionPrecedenceTracking.h
@@ -20,18 +20,18 @@
 #ifndef LLVM_ANALYSIS_INSTRUCTIONPRECEDENCETRACKING_H
 #define LLVM_ANALYSIS_INSTRUCTIONPRECEDENCETRACKING_H
 
-#include "llvm/IR/Dominators.h"
-#include "llvm/Analysis/OrderedInstructions.h"
+#include "llvm/ADT/DenseMap.h"
 
 namespace llvm {
 
+class BasicBlock;
+class Instruction;
+
 class InstructionPrecedenceTracking {
   // Maps a block to the topmost special instruction in it. If the value is
   // nullptr, it means that it is known that this block does not contain any
   // special instructions.
   DenseMap<const BasicBlock *, const Instruction *> FirstSpecialInsts;
-  // Allows to answer queries about precedence of instructions within one block.
-  OrderedInstructions OI;
 
   // Fills information about the given block's special instructions.
   void fill(const BasicBlock *BB);
@@ -49,9 +49,6 @@
 #endif
 
 protected:
-  InstructionPrecedenceTracking(DominatorTree *DT)
-      : OI(OrderedInstructions(DT)) {}
-
   /// Returns the topmost special instruction from the block \p BB. Returns
   /// nullptr if there is no special instructions in the block.
   const Instruction *getFirstSpecialInstruction(const BasicBlock *BB);
@@ -96,9 +93,6 @@
 /// perform PRE moving non-speculable instruction to other place.
 class ImplicitControlFlowTracking : public InstructionPrecedenceTracking {
 public:
-  ImplicitControlFlowTracking(DominatorTree *DT)
-      : InstructionPrecedenceTracking(DT) {}
-
   /// Returns the topmost instruction with implicit control flow from the given
   /// basic block. Returns nullptr if there is no such instructions in the block.
   const Instruction *getFirstICFI(const BasicBlock *BB) {
@@ -116,13 +110,11 @@
     return isPreceededBySpecialInstruction(Insn);
   }
 
-  virtual bool isSpecialInstruction(const Instruction *Insn) const;
+  bool isSpecialInstruction(const Instruction *Insn) const override;
 };
 
 class MemoryWriteTracking : public InstructionPrecedenceTracking {
 public:
-  MemoryWriteTracking(DominatorTree *DT) : InstructionPrecedenceTracking(DT) {}
-
   /// Returns the topmost instruction that may write memory from the given
   /// basic block. Returns nullptr if there is no such instructions in the block.
   const Instruction *getFirstMemoryWrite(const BasicBlock *BB) {
@@ -141,7 +133,7 @@
     return isPreceededBySpecialInstruction(Insn);
   }
 
-  virtual bool isSpecialInstruction(const Instruction *Insn) const;
+  bool isSpecialInstruction(const Instruction *Insn) const override;
 };
 
 } // llvm