Fix the hole loading optimization.

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index f1346d576323caeba83049e6a5d7aef3afcab75d..e7e63d1bdc52f64a390a3381702d8989092d1abc 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -2720,11 +2720,14 @@ bool HLoadKeyed::UsesMustHandleHole() const {
     return false;
   }
 
+  // Holes are only returned as tagged values.
+  if (!representation().IsTagged()) {
+    return false;
+  }
+
   for (HUseIterator it(uses()); !it.Done(); it.Advance()) {
     HValue* use = it.value();
-    if (!use->IsChange() || !HChange::cast(use)->to().IsDouble()) {
-      return false;
-    }
+    if (!use->IsChange()) return false;
   }
 
   return true;