[es6] Reintroduce the instanceof operator in the backends.

src/full-codegen/ia32/full-codegen-ia32.cc

Index: src/full-codegen/ia32/full-codegen-ia32.cc
diff --git a/src/full-codegen/ia32/full-codegen-ia32.cc b/src/full-codegen/ia32/full-codegen-ia32.cc
index b408a4850cef1cf74fc5b61bc050834845ba002e..b86f59ae4678471c6c09e2e4ce8da048d2a3e2bf 100644
--- a/src/full-codegen/ia32/full-codegen-ia32.cc
+++ b/src/full-codegen/ia32/full-codegen-ia32.cc
@@ -3029,13 +3029,6 @@ void FullCodeGenerator::EmitGetSuperConstructor(CallRuntime* expr) {
   context()->Plug(eax);
 }
 
-void FullCodeGenerator::EmitGetOrdinaryHasInstance(CallRuntime* expr) {
-  DCHECK_EQ(0, expr->arguments()->length());
-  __ mov(eax, NativeContextOperand());
-  __ mov(eax, ContextOperand(eax, Context::ORDINARY_HAS_INSTANCE_INDEX));
-  context()->Plug(eax);
-}
-
 void FullCodeGenerator::EmitDebugIsActive(CallRuntime* expr) {
   DCHECK(expr->arguments()->length() == 0);
   ExternalReference debug_is_active =