Clean up VMState a little bit.

src/x64/macro-assembler-x64.cc

Index: src/x64/macro-assembler-x64.cc
diff --git a/src/x64/macro-assembler-x64.cc b/src/x64/macro-assembler-x64.cc
index b38feb849e483a4cbea0a037771e7a31fd79c407..76491a331cebb03981e3788917c70bd5f33e66c6 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -725,8 +725,9 @@ void MacroAssembler::CallApiFunctionAndReturn(Address function_address,
   if (FLAG_log_timer_events) {
     FrameScope frame(this, StackFrame::MANUAL);
     PushSafepointRegisters();
-    PrepareCallCFunction(0);
-    CallCFunction(ExternalReference::log_enter_external_function(isolate()), 0);
+    PrepareCallCFunction(1);
+    LoadAddress(arg_reg_1, ExternalReference::isolate_address(isolate()));
+    CallCFunction(ExternalReference::log_enter_external_function(isolate()), 1);
     PopSafepointRegisters();
   }
 
@@ -738,8 +739,9 @@ void MacroAssembler::CallApiFunctionAndReturn(Address function_address,
   if (FLAG_log_timer_events) {
     FrameScope frame(this, StackFrame::MANUAL);
     PushSafepointRegisters();
-    PrepareCallCFunction(0);
-    CallCFunction(ExternalReference::log_leave_external_function(isolate()), 0);
+    PrepareCallCFunction(1);
+    LoadAddress(arg_reg_1, ExternalReference::isolate_address(isolate()));
+    CallCFunction(ExternalReference::log_leave_external_function(isolate()), 1);
     PopSafepointRegisters();
   }