Kill unused CodeGenInfo field in AstNode.

runtime/vm/ast.h

Index: runtime/vm/ast.h
diff --git a/runtime/vm/ast.h b/runtime/vm/ast.h
index 104ebf378cac30b47d74647c14274e5360c12596..a9be2622f9238ed9c7050b7d776b179b9a46878c 100644
--- a/runtime/vm/ast.h
+++ b/runtime/vm/ast.h
@@ -65,8 +65,6 @@ namespace dart {
 NODE_LIST(DEFINE_FORWARD_DECLARATION)
 #undef DEFINE_FORWARD_DECLARATION
 
-// Forward declarations.
-class CodeGenInfo;
 
 // Abstract class to implement an AST node visitor. An example is AstPrinter.
 class AstNodeVisitor : public ValueObject {
@@ -95,22 +93,17 @@ class AstNode : public ZoneAllocated {
  public:
   explicit AstNode(intptr_t token_pos)
       : token_pos_(token_pos),
-        ic_data_(ICData::ZoneHandle()),
-        info_(NULL) {
+        ic_data_(ICData::ZoneHandle()) {
     ASSERT(token_pos_ >= 0);
   }
 
   intptr_t token_pos() const { return token_pos_; }
 
-
   const ICData& ic_data() const { return ic_data_; }
   void set_ic_data(const ICData& value) {
     ic_data_ = value.raw();
   }
 
-  void set_info(CodeGenInfo* info) { info_ = info; }
-  CodeGenInfo* info() const { return info_; }
-
 #define AST_TYPE_CHECK(type, name)                                             \
   virtual bool Is##type() const { return false; }                              \
   virtual type* As##type() { return NULL; }
@@ -157,8 +150,6 @@ NODE_LIST(AST_TYPE_CHECK)
   const intptr_t token_pos_;
   // IC data collected for this node.
   ICData& ic_data_;
-  // Used by optimizing compiler.
-  CodeGenInfo* info_;
   DISALLOW_COPY_AND_ASSIGN(AstNode);
 };