Remove unused Zone argument from InitializeAstVisitor

src/compiler/ast-graph-builder.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_AST_GRAPH_BUILDER_H_
 #define V8_COMPILER_AST_GRAPH_BUILDER_H_
 
 #include "src/ast.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/liveness-analyzer.h"
@@ skipping 52 matching lines @@
   class ContextScope;
   class ControlScope;
   class ControlScopeForBreakable;
   class ControlScopeForIteration;
   class ControlScopeForCatch;
   class ControlScopeForFinally;
   class Environment;
   class FrameStateBeforeAndAfter;
   friend class ControlBuilder;
 
+  Isolate* isolate_;
   Zone* local_zone_;
   CompilationInfo* info_;
   JSGraph* jsgraph_;
   Environment* environment_;
   AstContext* ast_context_;
 
   // List of global declarations for functions and variables.
   ZoneVector<Handle<Object>> globals_;
 
   // Stack of control scopes currently entered by the visitor.
@@ skipping 39 matching lines @@
   // new nodes.
   static const int kInputBufferSizeIncrement = 64;
 
   Zone* local_zone() const { return local_zone_; }
   Environment* environment() const { return environment_; }
   AstContext* ast_context() const { return ast_context_; }
   ControlScope* execution_control() const { return execution_control_; }
   ContextScope* execution_context() const { return execution_context_; }
   CommonOperatorBuilder* common() const { return jsgraph_->common(); }
   CompilationInfo* info() const { return info_; }
-  Isolate* isolate() const;
+  Isolate* isolate() const { return isolate_; }
   LanguageMode language_mode() const;
   JSGraph* jsgraph() { return jsgraph_; }
   Graph* graph() { return jsgraph_->graph(); }
   Zone* graph_zone() { return graph()->zone(); }
   JSOperatorBuilder* javascript() { return jsgraph_->javascript(); }
   ZoneVector<Handle<Object>>* globals() { return &globals_; }
   Scope* current_scope() const;
   Node* current_context() const;
   LivenessAnalyzer* liveness_analyzer() { return &liveness_analyzer_; }
   const FrameStateFunctionInfo* frame_state_function_info() const {
@@ skipping 416 matching lines @@
 
   // Prepare environment to be used as loop header.
   void PrepareForLoop(BitVector* assigned, bool is_osr = false);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_AST_GRAPH_BUILDER_H_