MIPS: Clean up VMState a little bit.

Port r14421 (31cd7dda)

BUG=

Review URL: https://codereview.chromium.org/14483002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14429 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/macro-assembler-mips.cc

@@ -3925,8 +3925,9 @@ void MacroAssembler::CallApiFunctionAndReturn(ExternalReference function,
   if (FLAG_log_timer_events) {
     FrameScope frame(this, StackFrame::MANUAL);
     PushSafepointRegisters();
-    PrepareCallCFunction(0, a0);
-    CallCFunction(ExternalReference::log_enter_external_function(isolate()), 0);
+    PrepareCallCFunction(1, a0);
+    li(a0, Operand(ExternalReference::isolate_address(isolate())));
+    CallCFunction(ExternalReference::log_enter_external_function(isolate()), 1);
     PopSafepointRegisters();
   }
 
@@ -3945,8 +3946,9 @@ void MacroAssembler::CallApiFunctionAndReturn(ExternalReference function,
   if (FLAG_log_timer_events) {
     FrameScope frame(this, StackFrame::MANUAL);
     PushSafepointRegisters();
-    PrepareCallCFunction(0, a0);
-    CallCFunction(ExternalReference::log_leave_external_function(isolate()), 0);
+    PrepareCallCFunction(1, a0);
+    li(a0, Operand(ExternalReference::isolate_address(isolate())));
+    CallCFunction(ExternalReference::log_leave_external_function(isolate()), 1);
     PopSafepointRegisters();
   }