[Isolates] Removal of miscellaneous statics from the backend.

src/arm/virtual-frame-arm.h

Index: src/arm/virtual-frame-arm.h
===================================================================
--- src/arm/virtual-frame-arm.h	(revision 4871)
+++ src/arm/virtual-frame-arm.h	(working copy)
@@ -55,23 +55,26 @@
   class SpilledScope BASE_EMBEDDED {
    public:
     explicit SpilledScope(VirtualFrame* frame)
-      : old_is_spilled_(is_spilled_) {
+      : old_is_spilled_(
+          Isolate::Current()->is_virtual_frame_in_spilled_scope()) {
       if (frame != NULL) {
-        if (!is_spilled_) {
+        if (!old_is_spilled_) {
           frame->SpillAll();
         } else {
           frame->AssertIsSpilled();
         }
       }
-      is_spilled_ = true;
+      Isolate::Current()->set_is_virtual_frame_in_spilled_scope(true);
     }
     ~SpilledScope() {
-      is_spilled_ = old_is_spilled_;
+      Isolate::Current()->set_is_virtual_frame_in_spilled_scope(
+          old_is_spilled_);
     }
-    static bool is_spilled() { return is_spilled_; }
+    static bool is_spilled() {
+      return Isolate::Current()->is_virtual_frame_in_spilled_scope();
+    }
 
    private:
-    static bool is_spilled_;
     int old_is_spilled_;
 
     SpilledScope() { }