[Isolates] Fixing Win32 compile and running tests failure.

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index 4227c9c73916ae3d80504d773047384f098f9900..724b59dc5f642a39824165c61e2d7cf682e11b56 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -285,12 +285,15 @@ Isolate::Isolate()
 #undef ISOLATE_INIT_ARRAY_EXECUTE
 }
 
-
-void Isolate::TearDownAndRecreateGlobalIsolate() {
+void Isolate::TearDown() {
   if (global_isolate_ != NULL) {
     delete global_isolate_;
     global_isolate_ = NULL;
   }
+}
+
+void Isolate::TearDownAndRecreateGlobalIsolate() {
+  TearDown();
 
   global_isolate_ = new Isolate();
   global_isolate_->PreInit();