Faster invocation of custom comparator function.

src/ia32/codegen-ia32.h

Index: src/ia32/codegen-ia32.h
diff --git a/src/ia32/codegen-ia32.h b/src/ia32/codegen-ia32.h
index a9dafa70ea9bb5d220859cd5c68ae8fac74cc3ff..03a0fbacc25d5e9870c9339d92cafc4643591f06 100644
--- a/src/ia32/codegen-ia32.h
+++ b/src/ia32/codegen-ia32.h
@@ -631,6 +631,9 @@ class CodeGenerator: public AstVisitor {
   // Fast support for number to string.
   void GenerateNumberToString(ZoneList<Expression*>* args);
 
+  // Fast call for custom callbacks.
+  void GenerateCallFunction(ZoneList<Expression*>* args);
+
   // Fast call to math functions.
   void GenerateMathPow(ZoneList<Expression*>* args);
   void GenerateMathSin(ZoneList<Expression*>* args);