Remove unused 'receiver' field from generators

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..79bc9dfa5bb1ec029d42c42cfca6ce8ac3a66f25 100644
--- a/src/arm/builtins-arm.cc
+++ b/src/arm/builtins-arm.cc
@@ -736,9 +736,8 @@ void Builtins::Generate_ResumeGeneratorTrampoline(MacroAssembler* masm) {
   }
   __ bind(&skip_flooding);
 
-  // Push receiver.
-  __ ldr(ip, FieldMemOperand(r1, JSGeneratorObject::kReceiverOffset));
-  __ Push(ip);
+  // Push hole for the never-used receiver, similarly to arguments below.
+  __ PushRoot(Heap::kTheHoleValueRootIndex);
 
   // ----------- S t a t e -------------
   //  -- r1    : the JSGeneratorObject to resume