Remove unused LivenessAnalyzer class.

src/data-flow.h

Index: src/data-flow.h
===================================================================
--- src/data-flow.h	(revision 4192)
+++ src/data-flow.h	(working copy)
@@ -550,55 +550,6 @@
 };
 
 
-class VarUseMap : public HashMap {
- public:
-  VarUseMap() : HashMap(VarMatch) {}
-
-  ZoneList<Expression*>* Lookup(Variable* var);
-
- private:
-  static bool VarMatch(void* key1, void* key2) { return key1 == key2; }
-};
-
-
-class DefinitionInfo : public ZoneObject {
- public:
-  explicit DefinitionInfo() : last_use_(NULL) {}
-
-  Expression* last_use() { return last_use_; }
-  void set_last_use(Expression* expr) { last_use_ = expr; }
-
- private:
-  Expression* last_use_;
-  Register location_;
-};
-
-
-class LivenessAnalyzer : public AstVisitor {
- public:
-  LivenessAnalyzer() {}
-
-  void Analyze(FunctionLiteral* fun);
-
- private:
-  void VisitStatements(ZoneList<Statement*>* stmts);
-
-  void RecordUse(Variable* var, Expression* expr);
-  void RecordDef(Variable* var, Expression* expr);
-
-
-  // AST node visit functions.
-#define DECLARE_VISIT(type) virtual void Visit##type(type* node);
-  AST_NODE_LIST(DECLARE_VISIT)
-#undef DECLARE_VISIT
-
-  // Map for tracking the live variables.
-  VarUseMap live_vars_;
-
-  DISALLOW_COPY_AND_ASSIGN(LivenessAnalyzer);
-};
-
-
 // Computes the set of assigned variables and annotates variables proxies
 // that are trivial sub-expressions and for-loops where the loop variable
 // is guaranteed to be a smi.