Clean up VMState a little bit.

src/arm/macro-assembler-arm.cc

Index: src/arm/macro-assembler-arm.cc
diff --git a/src/arm/macro-assembler-arm.cc b/src/arm/macro-assembler-arm.cc
index bbbe520738fe7a596f955513c6c15c26ce7f415e..b7cd3db046c066cb66e61f0342ecd3cfc018139d 100644
--- a/src/arm/macro-assembler-arm.cc
+++ b/src/arm/macro-assembler-arm.cc
@@ -2264,8 +2264,9 @@ void MacroAssembler::CallApiFunctionAndReturn(ExternalReference function,
   if (FLAG_log_timer_events) {
     FrameScope frame(this, StackFrame::MANUAL);
     PushSafepointRegisters();
-    PrepareCallCFunction(0, r0);
-    CallCFunction(ExternalReference::log_enter_external_function(isolate()), 0);
+    PrepareCallCFunction(1, r0);
+    mov(r0, Operand(ExternalReference::isolate_address(isolate())));
+    CallCFunction(ExternalReference::log_enter_external_function(isolate()), 1);
     PopSafepointRegisters();
   }
 
@@ -2278,8 +2279,9 @@ void MacroAssembler::CallApiFunctionAndReturn(ExternalReference function,
   if (FLAG_log_timer_events) {
     FrameScope frame(this, StackFrame::MANUAL);
     PushSafepointRegisters();
-    PrepareCallCFunction(0, r0);
-    CallCFunction(ExternalReference::log_leave_external_function(isolate()), 0);
+    PrepareCallCFunction(1, r0);
+    mov(r0, Operand(ExternalReference::isolate_address(isolate())));
+    CallCFunction(ExternalReference::log_leave_external_function(isolate()), 1);
     PopSafepointRegisters();
   }