Thread the current isolate through a few places, avoiding Isolate::Current().

src/execution.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 854 matching lines @@
 
   // Notify the debug event listeners. Indicate auto continue if the break was
   // a debug command break.
   isolate->debugger()->OnDebugBreak(isolate->factory()->undefined_value(),
                                     debug_command_only);
 }
 
 
 #endif
 
-MaybeObject* Execution::HandleStackGuardInterrupt() {
-  Isolate* isolate = Isolate::Current();
+MaybeObject* Execution::HandleStackGuardInterrupt(Isolate* isolate) {
   StackGuard* stack_guard = isolate->stack_guard();
 
   if (stack_guard->IsGCRequest()) {
     isolate->heap()->CollectAllGarbage(false, "StackGuard GC request");
     stack_guard->Continue(GC_REQUEST);
   }
 
   isolate->counters()->stack_interrupts()->Increment();
   // If FLAG_count_based_interrupts, every interrupt is a profiler interrupt.
   if (FLAG_count_based_interrupts ||
@@ skipping 14 matching lines @@
   }
   if (stack_guard->IsInterrupted()) {
     stack_guard->Continue(INTERRUPT);
     return isolate->StackOverflow();
   }
   return isolate->heap()->undefined_value();
 }
 
 
 } }  // namespace v8::internal