[Isolates] Move contents of Top into Isolate....

src/regexp-macro-assembler.cc

Index: src/regexp-macro-assembler.cc
===================================================================
--- src/regexp-macro-assembler.cc	(revision 4906)
+++ src/regexp-macro-assembler.cc	(working copy)
@@ -176,10 +176,10 @@
   ASSERT(result <= SUCCESS);
   ASSERT(result >= RETRY);
 
-  if (result == EXCEPTION && !Top::has_pending_exception()) {
+  if (result == EXCEPTION && !Isolate::Current()->has_pending_exception()) {
     // We detected a stack overflow (on the backtrack stack) in RegExp code,
     // but haven't created the exception yet.
-    Top::StackOverflow();
+    Isolate::Current()->StackOverflow();
   }
   return static_cast<Result>(result);
 }