Introduce API to temporarily interrupt long running JavaScript code.

src/hydrogen-sce.cc

 // Copyright 2013 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 25 matching lines @@
   // the loop header. If a call instruction is encountered the backwards branch
   // is dominated by a call and the stack check in the backwards branch can be
   // removed.
   for (int i = 0; i < graph()->blocks()->length(); i++) {
     HBasicBlock* block = graph()->blocks()->at(i);
     if (block->IsLoopHeader()) {
       HBasicBlock* back_edge = block->loop_information()->GetLastBackEdge();
       HBasicBlock* dominator = back_edge;
       while (true) {
         for (HInstructionIterator it(dominator); !it.Done(); it.Advance()) {
-          if (it.Current()->IsCall()) {
+          if (it.Current()->HasStackCheck()) {
             block->loop_information()->stack_check()->Eliminate();
             break;
           }
         }
 
         // Done when the loop header is processed.
         if (dominator == block) break;
 
         // Move up the dominator tree.
         dominator = dominator->dominator();
       }
     }
   }
 }
 
 } }  // namespace v8::internal