[ast] Remove unused kModule constant.

src/ast/ast.h

 // Copyright 2012 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_AST_AST_H_
 #define V8_AST_AST_H_
 
 #include "src/ast/ast-value-factory.h"
 #include "src/ast/modules.h"
 #include "src/ast/variables.h"
@@ skipping 173 matching lines @@
   int node_count_;
   FeedbackVectorSpec spec_;
 };
 
 DEFINE_OPERATORS_FOR_FLAGS(AstProperties::Flags)
 
 
 class AstNode: public ZoneObject {
  public:
 #define DECLARE_TYPE_ENUM(type) k##type,
-  enum NodeType : uint8_t { kModule = 0, AST_NODE_LIST(DECLARE_TYPE_ENUM) };
+  enum NodeType : uint8_t { AST_NODE_LIST(DECLARE_TYPE_ENUM) };
 #undef DECLARE_TYPE_ENUM
 
   void* operator new(size_t size, Zone* zone) { return zone->New(size); }
 
   NodeType node_type() const { return node_type_; }
   int position() const { return position_; }
 
 #ifdef DEBUG
   void Print(Isolate* isolate);
 #endif  // DEBUG
@@ skipping 2720 matching lines @@
   Subclass* impl() { return static_cast<Subclass*>(this); }
 };
 
 #define GENERATE_VISIT_CASE(NodeType)                                   \
   case AstNode::k##NodeType:                                            \
     return this->impl()->Visit##NodeType(static_cast<NodeType*>(node));
 
 #define GENERATE_AST_VISITOR_SWITCH()  \
   switch (node->node_type()) {         \
     AST_NODE_LIST(GENERATE_VISIT_CASE) \
-    case AstNode::kModule:             \
-      UNREACHABLE();                   \
   }
 
 #define DEFINE_AST_VISITOR_SUBCLASS_MEMBERS()               \
  public:                                                    \
   void Visit(AstNode* node) {                               \
     if (CheckStackOverflow()) return;                       \
     GENERATE_AST_VISITOR_SWITCH()                           \
   }                                                         \
                                                             \
   void SetStackOverflow() { stack_overflow_ = true; }       \
@@ skipping 583 matching lines @@
                                     : NULL;                                   \
   }
 AST_NODE_LIST(DECLARE_NODE_FUNCTIONS)
 #undef DECLARE_NODE_FUNCTIONS
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_AST_AST_H_