Our JavaScriptFrame::function_slot_object is arch independent.

src/mips/frames-mips.h

Index: src/mips/frames-mips.h
diff --git a/src/mips/frames-mips.h b/src/mips/frames-mips.h
index f0b734db1c69dfb4a52355c5db005d518a5f2fa4..0452ece222bba6253f6c431865b4dbe13a30fa79 100644
--- a/src/mips/frames-mips.h
+++ b/src/mips/frames-mips.h
@@ -169,12 +169,6 @@ class JavaScriptFrameConstants : public AllStatic {
 };
 
 
-inline Object* JavaScriptFrame::function_slot_object() const {
-  const int offset = JavaScriptFrameConstants::kFunctionOffset;
-  return Memory::Object_at(fp() + offset);
-}
-
-
 } }  // namespace v8::internal
 
 #endif