Nuke CompareToNull AST node.

src/prettyprinter.cc

Index: src/prettyprinter.cc
===================================================================
--- src/prettyprinter.cc	(revision 9281)
+++ src/prettyprinter.cc	(working copy)
@@ -372,13 +372,6 @@
 }
 
 
-void PrettyPrinter::VisitCompareToNull(CompareToNull* node) {
-  Print("(");
-  Visit(node->expression());
-  Print("%s null)", Token::String(node->op()));
-}
-
-
 void PrettyPrinter::VisitThisFunction(ThisFunction* node) {
   Print("<this-function>");
 }
@@ -1020,15 +1013,6 @@
 }
 
 
-void AstPrinter::VisitCompareToNull(CompareToNull* node) {
-  const char* name = node->is_strict()
-      ? "COMPARE-TO-NULL-STRICT"
-      : "COMPARE-TO-NULL";
-  IndentedScope indent(this, name, node);
-  Visit(node->expression());
-}
-
-
 void AstPrinter::VisitThisFunction(ThisFunction* node) {
   IndentedScope indent(this, "THIS-FUNCTION");
 }
@@ -1404,16 +1388,6 @@
 }
 
 
-void JsonAstBuilder::VisitCompareToNull(CompareToNull* expr) {
-  TagScope tag(this, "CompareToNull");
-  {
-    AttributesScope attributes(this);
-    AddAttribute("is_strict", expr->is_strict());
-  }
-  Visit(expr->expression());
-}
-
-
 void JsonAstBuilder::VisitThisFunction(ThisFunction* expr) {
   TagScope tag(this, "ThisFunction");
 }