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

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 53f1b65755beaa3cbaa3ada0086830d60529bc27..a3264e8e0104e3e1d3c3cf8fea79e83392512e92 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -1545,7 +1545,7 @@ class HStackCheck: public HTemplateInstruction<1> {
     // The stack check eliminator might try to eliminate the same stack
     // check instruction multiple times.
     if (IsLinked()) {
-      DeleteFromGraph();
+      DeleteAndReplaceWith(NULL);
     }
   }