CallIC MISS handler doesn't need receiver.

src/x64/code-stubs-x64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
@@ skipping 2227 matching lines @@
   __ CmpObjectType(rdi, JS_FUNCTION_TYPE, rcx);
   __ j(not_equal, &slow);
   __ jmp(&have_js_function);
 
   // Unreachable
   __ int3();
 }
 
 
 void CallICStub::GenerateMiss(MacroAssembler* masm) {
-  // Get the receiver of the function from the stack; 1 ~ return address.
-  __ movp(rcx, Operand(rsp, (arg_count() + 1) * kPointerSize));
+  FrameScope scope(masm, StackFrame::INTERNAL);
 
-  {
-    FrameScope scope(masm, StackFrame::INTERNAL);
+  // Push the receiver and the function and feedback info.
+  __ Push(rdi);
+  __ Push(rbx);
+  __ Integer32ToSmi(rdx, rdx);
+  __ Push(rdx);
 
-    // Push the receiver and the function and feedback info.
-    __ Push(rcx);
-    __ Push(rdi);
-    __ Push(rbx);
-    __ Integer32ToSmi(rdx, rdx);
-    __ Push(rdx);
+  // Call the entry.
+  IC::UtilityId id = GetICState() == DEFAULT ? IC::kCallIC_Miss
+                                             : IC::kCallIC_Customization_Miss;
 
-    // Call the entry.
-    IC::UtilityId id = GetICState() == DEFAULT ? IC::kCallIC_Miss
-                                               : IC::kCallIC_Customization_Miss;
+  ExternalReference miss = ExternalReference(IC_Utility(id), masm->isolate());
+  __ CallExternalReference(miss, 3);
 
-    ExternalReference miss = ExternalReference(IC_Utility(id),
-                                               masm->isolate());
-    __ CallExternalReference(miss, 4);
-
-    // Move result to edi and exit the internal frame.
-    __ movp(rdi, rax);
-  }
+  // Move result to edi and exit the internal frame.
+  __ movp(rdi, rax);
 }
 
 
 bool CEntryStub::NeedsImmovableCode() {
   return false;
 }
 
 
 void CodeStub::GenerateStubsAheadOfTime(Isolate* isolate) {
   CEntryStub::GenerateAheadOfTime(isolate);
@@ skipping 2779 matching lines @@
   CallApiFunctionAndReturn(masm, api_function_address, thunk_ref, getter_arg,
                            kStackSpace, nullptr, return_value_operand, NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64