[runtime] Initial step towards switching Execution::Call to callable.

src/x64/builtins-x64.cc

 // Copyright 2012 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.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/code-factory.h"
 #include "src/codegen.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 575 matching lines @@
     __ j(not_equal, &loop);
 
     // Invoke the code.
     if (is_construct) {
       // No type feedback cell is available
       __ LoadRoot(rbx, Heap::kUndefinedValueRootIndex);
       // Expects rdi to hold function pointer.
       CallConstructStub stub(masm->isolate(), NO_CALL_CONSTRUCTOR_FLAGS);
       __ CallStub(&stub);
     } else {
-      ParameterCount actual(rax);
-      // Function must be in rdi.
-      __ InvokeFunction(rdi, actual, CALL_FUNCTION, NullCallWrapper());
+      __ Call(masm->isolate()->builtins()->Call(), RelocInfo::CODE_TARGET);
     }
     // Exit the internal frame. Notice that this also removes the empty
     // context and the function left on the stack by the code
     // invocation.
   }
 
   // TODO(X64): Is argument correct? Is there a receiver to remove?
   __ ret(1 * kPointerSize);  // Remove receiver.
 }
 
@@ skipping 1222 matching lines @@
   __ ret(0);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64