Templatize AstVisitor with its subclass

src/compiler/ast-loop-assignment-analyzer.h

Index: src/compiler/ast-loop-assignment-analyzer.h
diff --git a/src/compiler/ast-loop-assignment-analyzer.h b/src/compiler/ast-loop-assignment-analyzer.h
index a4a4609757b080f89fad8e94a5d0324c59247a0f..57062edabd7b7fe0f287cacc8d6a1d2c6bae61d0 100644
--- a/src/compiler/ast-loop-assignment-analyzer.h
+++ b/src/compiler/ast-loop-assignment-analyzer.h
@@ -40,13 +40,14 @@ class LoopAssignmentAnalysis : public ZoneObject {
 
 
 // The class that performs loop assignment analysis by walking the AST.
-class AstLoopAssignmentAnalyzer : public AstVisitor {
+class AstLoopAssignmentAnalyzer final
+    : public AstVisitor<AstLoopAssignmentAnalyzer> {
  public:
   AstLoopAssignmentAnalyzer(Zone* zone, CompilationInfo* info);
 
   LoopAssignmentAnalysis* Analyze();
 
-#define DECLARE_VISIT(type) void Visit##type(type* node) override;
+#define DECLARE_VISIT(type) void Visit##type(type* node);
   AST_NODE_LIST(DECLARE_VISIT)
 #undef DECLARE_VISIT