Remove v8::i::Isolate::Current from cctests

test/cctest/test-code-stubs-mips64.cc

Index: test/cctest/test-code-stubs-mips64.cc
diff --git a/test/cctest/test-code-stubs-mips64.cc b/test/cctest/test-code-stubs-mips64.cc
index d8b047b0f0df78d5ce809123a05955db38953447..7b40d44c483ea27b860c6bdda3225da16832f45e 100644
--- a/test/cctest/test-code-stubs-mips64.cc
+++ b/test/cctest/test-code-stubs-mips64.cc
@@ -157,9 +157,10 @@ static Isolate* GetIsolateFrom(LocalContext* context) {
 int32_t RunGeneratedCodeCallWrapper(ConvertDToIFunc func,
                                     double from) {
 #ifdef USE_SIMULATOR
-  Simulator::current(Isolate::Current())->CallFP(FUNCTION_ADDR(func), from, 0.);
+  Simulator::current(CcTest::i_isolate())
+      ->CallFP(FUNCTION_ADDR(func), from, 0.);
   return static_cast<int32_t>(
-      Simulator::current(Isolate::Current())->get_register(v0.code()));
+      Simulator::current(CcTest::i_isolate())->get_register(v0.code()));
 #else
   return (*func)(from);
 #endif