Fix issue 284....

src/codegen-ia32.cc

 // Copyright 2006-2009 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 2665 matching lines @@
   frame_->SpillAll();
 
   // Discard the i'th entry pushed above or else the remainder of the
   // reference, whichever is currently on top of the stack.
   frame_->Drop();
 
   // Body.
   CheckStack();  // TODO(1222600): ignore if body contains calls.
   VisitAndSpill(node->body());
 
-  // Next.
+  // Next.  Reestablish a spilled frame in case we are coming here via
+  // a continue in the body.
   node->continue_target()->Bind();
+  frame_->SpillAll();
   frame_->EmitPop(eax);
   __ add(Operand(eax), Immediate(Smi::FromInt(1)));
   frame_->EmitPush(eax);
   entry.Jump();
 
-  // Cleanup.
+  // Cleanup.  No need to spill because VirtualFrame::Drop is safe for
+  // any frame.
   node->break_target()->Bind();
   frame_->Drop(5);
 
   // Exit.
   exit.Bind();
 
   node->continue_target()->Unuse();
   node->break_target()->Unuse();
 }
 
@@ skipping 4287 matching lines @@
 
   // Slow-case: Go through the JavaScript implementation.
   __ bind(&slow);
   __ InvokeBuiltin(Builtins::INSTANCE_OF, JUMP_FUNCTION);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal