Remove instructions properly (stack check elimination was leaving "dangling uses" around).

src/hydrogen-instructions.h

 // 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 1527 matching lines @@
   HValue* context() { return OperandAt(0); }
 
   virtual Representation RequiredInputRepresentation(int index) {
     return Representation::Tagged();
   }
 
   void Eliminate() {
     // The stack check eliminator might try to eliminate the same stack
     // check instruction multiple times.
     if (IsLinked()) {
-      DeleteFromGraph();
+      DeleteAndReplaceWith(NULL);
     }
   }
 
   bool is_function_entry() { return type_ == kFunctionEntry; }
   bool is_backwards_branch() { return type_ == kBackwardsBranch; }
 
   DECLARE_CONCRETE_INSTRUCTION(StackCheck)
 
  private:
   Type type_;
@@ skipping 4184 matching lines @@
   virtual bool IsDeletable() const { return true; }
 };
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_