[es6] Reintroduce the instanceof operator in the backends.

src/arm/builtins-arm.cc

Index: src/arm/builtins-arm.cc
diff --git a/src/arm/builtins-arm.cc b/src/arm/builtins-arm.cc
index 3edffeab832de5db9fed20fdef2281e659df76c5..8e47025430e748bb72638ca3e131b68b8b84cd41 100644
--- a/src/arm/builtins-arm.cc
+++ b/src/arm/builtins-arm.cc
@@ -1748,28 +1748,6 @@ void Builtins::Generate_DatePrototype_GetField(MacroAssembler* masm,
 }
 
 // static
-void Builtins::Generate_FunctionHasInstance(MacroAssembler* masm) {
-  // ----------- S t a t e -------------
-  //  -- r0    : argc
-  //  -- sp[0] : first argument (left-hand side)
-  //  -- sp[4] : receiver (right-hand side)
-  // -----------------------------------
-
-  {
-    FrameScope scope(masm, StackFrame::INTERNAL);
-    __ ldr(InstanceOfDescriptor::LeftRegister(),
-           MemOperand(fp, 2 * kPointerSize));  // Load left-hand side.
-    __ ldr(InstanceOfDescriptor::RightRegister(),
-           MemOperand(fp, 3 * kPointerSize));  // Load right-hand side.
-    InstanceOfStub stub(masm->isolate(), true);
-    __ CallStub(&stub);
-  }
-
-  // Pop the argument and the receiver.
-  __ Ret(2);
-}
-
-// static
 void Builtins::Generate_FunctionPrototypeApply(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- r0    : argc