Remove unused LivenessAnalyzer class.

src/ast.h

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 178 matching lines @@
     // Evaluated for control flow (and side effects).
     kTest,
     // Evaluated for control flow and side effects.  Value is also
     // needed if true.
     kValueTest,
     // Evaluated for control flow and side effects.  Value is also
     // needed if false.
     kTestValue
   };
 
-  Expression()
-      : bitfields_(0),
-        def_(NULL),
-        defined_vars_(NULL) {}
+  Expression() : bitfields_(0) {}
 
   virtual Expression* AsExpression()  { return this; }
 
   virtual bool IsValidLeftHandSide() { return false; }
 
   virtual Variable* AssignedVar() { return NULL; }
 
   // Symbols that cannot be parsed as array indices are considered property
   // names.  We do not treat symbols that can be array indexes as property
   // names because [] for string objects is handled only by keyed ICs.
@@ skipping 13 matching lines @@
   virtual bool IsPrimitive() = 0;
 
   // Mark the expression as being compiled as an expression
   // statement. This is used to transform postfix increments to
   // (faster) prefix increments.
   virtual void MarkAsStatement() { /* do nothing */ }
 
   // Static type information for this expression.
   StaticType* type() { return &type_; }
 
-  // Data flow information.
-  DefinitionInfo* var_def() { return def_; }
-  void set_var_def(DefinitionInfo* def) { def_ = def; }
-
-  ZoneList<DefinitionInfo*>* defined_vars() { return defined_vars_; }
-  void set_defined_vars(ZoneList<DefinitionInfo*>* defined_vars) {
-    defined_vars_ = defined_vars;
-  }
-
   // AST analysis results
 
   // True if the expression rooted at this node can be compiled by the
   // side-effect free compiler.
   bool side_effect_free() { return SideEffectFreeField::decode(bitfields_); }
   void set_side_effect_free(bool is_side_effect_free) {
     bitfields_ &= ~SideEffectFreeField::mask();
     bitfields_ |= SideEffectFreeField::encode(is_side_effect_free);
   }
 
@@ skipping 22 matching lines @@
     bitfields_ |= NumBitOpsField::encode(num_bit_ops);
   }
 
 
  private:
   static const int kMaxNumBitOps = (1 << 5) - 1;
 
   uint32_t bitfields_;
   StaticType type_;
 
-  DefinitionInfo* def_;
-  ZoneList<DefinitionInfo*>* defined_vars_;
-
   // Using template BitField<type, start, size>.
   class SideEffectFreeField : public BitField<bool, 0, 1> {};
   class NoNegativeZeroField : public BitField<bool, 1, 1> {};
   class ToInt32Field : public BitField<bool, 2, 1> {};
   class NumBitOpsField : public BitField<int, 3, 5> {};
 };
 
 
 /**
  * A sentinel used during pre parsing that represents some expression
@@ skipping 1704 matching lines @@
 #undef DEF_VISIT
 
  private:
   bool stack_overflow_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_AST_H_