[es6] Reintroduce the instanceof operator in the backends.

src/full-codegen/full-codegen.h

Index: src/full-codegen/full-codegen.h
diff --git a/src/full-codegen/full-codegen.h b/src/full-codegen/full-codegen.h
index dbb4a0b028c0a6cd883e3a0ca479da465536140c..1044f4038ce6efa36eff383cb26cf03fb6af2604 100644
--- a/src/full-codegen/full-codegen.h
+++ b/src/full-codegen/full-codegen.h
@@ -545,7 +545,6 @@ class FullCodeGenerator: public AstVisitor {
   F(ToName)                             \
   F(ToObject)                           \
   F(DebugIsActive)                      \
-  F(GetOrdinaryHasInstance)             \
   F(CreateIterResultObject)
 
 #define GENERATOR_DECLARATION(Name) void Emit##Name(CallRuntime* call);