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/PostDominators.h b/linux-x64/clang/include/llvm/Analysis/PostDominators.h
index 87d2e03..296110d 100644
--- a/linux-x64/clang/include/llvm/Analysis/PostDominators.h
+++ b/linux-x64/clang/include/llvm/Analysis/PostDominators.h
@@ -34,6 +34,13 @@
   /// Handle invalidation explicitly.
   bool invalidate(Function &F, const PreservedAnalyses &PA,
                   FunctionAnalysisManager::Invalidator &);
+
+  // Ensure base-class overloads are visible.
+  using Base::dominates;
+
+  /// Return true if \p I1 dominates \p I2. This checks if \p I2 comes before
+  /// \p I1 if they belongs to the same basic block.
+  bool dominates(const Instruction *I1, const Instruction *I2) const;
 };
 
 /// Analysis pass which computes a \c PostDominatorTree.
@@ -68,9 +75,7 @@
 
   PostDominatorTree DT;
 
-  PostDominatorTreeWrapperPass() : FunctionPass(ID) {
-    initializePostDominatorTreeWrapperPassPass(*PassRegistry::getPassRegistry());
-  }
+  PostDominatorTreeWrapperPass();
 
   PostDominatorTree &getPostDomTree() { return DT; }
   const PostDominatorTree &getPostDomTree() const { return DT; }
@@ -83,9 +88,7 @@
     AU.setPreservesAll();
   }
 
-  void releaseMemory() override {
-    DT.releaseMemory();
-  }
+  void releaseMemory() override { DT.reset(); }
 
   void print(raw_ostream &OS, const Module*) const override;
 };