[stubs] Drop CallApiCallbackStub::call_data_undefined optimization.

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index bfacf6c62cc5682df71cf992129185ff62a81d80..7a1b905fd6846e5685479520be90386161186d25 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -827,39 +827,29 @@ class CallApiCallbackStub : public PlatformCodeStub {
   static const int kArgMax = (1 << kArgBits) - 1;
 
   // CallApiCallbackStub for regular setters and getters.
-  CallApiCallbackStub(Isolate* isolate, bool is_store, bool call_data_undefined,
-                      bool is_lazy)
-      : CallApiCallbackStub(isolate, is_store ? 1 : 0, is_store,
-                            call_data_undefined, is_lazy) {}
+  CallApiCallbackStub(Isolate* isolate, bool is_store, bool is_lazy)
+      : CallApiCallbackStub(isolate, is_store ? 1 : 0, is_store, is_lazy) {}
 
   // CallApiCallbackStub for callback functions.
-  CallApiCallbackStub(Isolate* isolate, int argc, bool call_data_undefined,
-                      bool is_lazy)
-      : CallApiCallbackStub(isolate, argc, false, call_data_undefined,
-                            is_lazy) {}
+  CallApiCallbackStub(Isolate* isolate, int argc, bool is_lazy)
+      : CallApiCallbackStub(isolate, argc, false, is_lazy) {}
 
  private:
-  CallApiCallbackStub(Isolate* isolate, int argc, bool is_store,
-                      bool call_data_undefined, bool is_lazy)
+  CallApiCallbackStub(Isolate* isolate, int argc, bool is_store, bool is_lazy)
       : PlatformCodeStub(isolate) {
     CHECK(0 <= argc && argc <= kArgMax);
     minor_key_ = IsStoreBits::encode(is_store) |
-                 CallDataUndefinedBits::encode(call_data_undefined) |
                  ArgumentBits::encode(argc) |
                  IsLazyAccessorBits::encode(is_lazy);
   }
 
   bool is_store() const { return IsStoreBits::decode(minor_key_); }
   bool is_lazy() const { return IsLazyAccessorBits::decode(minor_key_); }
-  bool call_data_undefined() const {
-    return CallDataUndefinedBits::decode(minor_key_);
-  }
   int argc() const { return ArgumentBits::decode(minor_key_); }
 
   class IsStoreBits: public BitField<bool, 0, 1> {};
-  class CallDataUndefinedBits: public BitField<bool, 1, 1> {};
+  class IsLazyAccessorBits : public BitField<bool, 1, 1> {};
   class ArgumentBits : public BitField<int, 2, kArgBits> {};
-  class IsLazyAccessorBits : public BitField<bool, 3 + kArgBits, 1> {};
 
   DEFINE_CALL_INTERFACE_DESCRIPTOR(ApiCallback);
   DEFINE_PLATFORM_CODE_STUB(CallApiCallback, PlatformCodeStub);