Remove unused 'receiver' field from generators

src/mips/builtins-mips.cc

Index: src/mips/builtins-mips.cc
diff --git a/src/mips/builtins-mips.cc b/src/mips/builtins-mips.cc
index aff49b6a8a954b443ebac12cec0f2940390a7d41..8072403c3328f846e5ae75deff09de575fbcbfc0 100644
--- a/src/mips/builtins-mips.cc
+++ b/src/mips/builtins-mips.cc
@@ -856,9 +856,8 @@ void Builtins::Generate_ResumeGeneratorTrampoline(MacroAssembler* masm) {
   }
   __ bind(&skip_flooding);
 
-  // Push receiver.
-  __ lw(t1, FieldMemOperand(a1, JSGeneratorObject::kReceiverOffset));
-  __ Push(t1);
+  // Push hole for the never-used receiver, similarly to arguments below.
+  __ PushRoot(Heap::kTheHoleValueRootIndex);
 
   // ----------- S t a t e -------------
   //  -- a1    : the JSGeneratorObject to resume