Remove an unused field in the AST.

runtime/vm/ast.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_AST_H_
 #define VM_AST_H_
 
 #include "platform/assert.h"
 #include "vm/allocation.h"
 #include "vm/growable_array.h"
@@ skipping 1565 matching lines @@
  public:
   static const int kInvalidTryIndex = -1;
 
   CatchClauseNode(intptr_t token_pos,
                   SequenceNode* catch_block,
                   const Array& handler_types,
                   const LocalVariable* context_var,
                   const LocalVariable* exception_var,
                   const LocalVariable* stacktrace_var)
       : AstNode(token_pos),
-        try_index_(kInvalidTryIndex),
         catch_block_(catch_block),
         handler_types_(handler_types),
         context_var_(*context_var),
         exception_var_(*exception_var),
         stacktrace_var_(*stacktrace_var) {
     ASSERT(catch_block_ != NULL);
     ASSERT(handler_types.IsZoneHandle());
     ASSERT(context_var != NULL);
     ASSERT(exception_var != NULL);
     ASSERT(stacktrace_var != NULL);
   }
 
-  int try_index() const {
-    ASSERT(try_index_ >= 0);
-    return try_index_;
-  }
-  void set_try_index(int value) { try_index_ = value; }
-
   const Array& handler_types() const { return handler_types_; }
   const LocalVariable& context_var() const { return context_var_; }
   const LocalVariable& exception_var() const { return exception_var_; }
   const LocalVariable& stacktrace_var() const { return stacktrace_var_; }
 
   virtual void VisitChildren(AstNodeVisitor* visitor) const {
     catch_block_->Visit(visitor);
   }
 
   DECLARE_COMMON_NODE_FUNCTIONS(CatchClauseNode);
 
  private:
-  int try_index_;  // Running index of the try blocks seen in a function.
   SequenceNode* catch_block_;
   const Array& handler_types_;
   const LocalVariable& context_var_;
   const LocalVariable& exception_var_;
   const LocalVariable& stacktrace_var_;
 
   DISALLOW_COPY_AND_ASSIGN(CatchClauseNode);
 };
 
 
@@ skipping 99 matching lines @@
   const LocalVariable& context_var_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(InlinedFinallyNode);
 };
 
 }  // namespace dart
 
 #undef DECLARE_COMMON_NODE_FUNCTIONS
 
 #endif  // VM_AST_H_