Fix load elimination: can only .Equals() GVN-able instructions.

src/hydrogen-load-elimination.cc

Index: src/hydrogen-load-elimination.cc
diff --git a/src/hydrogen-load-elimination.cc b/src/hydrogen-load-elimination.cc
index f37de90ff3d37311d0d3d4fa6916967bed036b87..f3b574847f8e3ed6b9e5807fa0cee894b18af41b 100644
--- a/src/hydrogen-load-elimination.cc
+++ b/src/hydrogen-load-elimination.cc
@@ -349,7 +349,9 @@ class HLoadEliminationTable : public ZoneObject {
 
   bool Equal(HValue* a, HValue* b) {
     if (a == b) return true;
-    if (a != NULL && b != NULL) return a->Equals(b);
+    if (a != NULL && b != NULL && a->CheckFlag(HValue::kUseGVN)) {
+      return a->Equals(b);
+    }
     return false;
   }