TransitionAndStoreStub bailout needs to transition (and store).

test/mjsunit/allocation-site-info.js

Index: test/mjsunit/allocation-site-info.js
diff --git a/test/mjsunit/allocation-site-info.js b/test/mjsunit/allocation-site-info.js
index dd22f573f0715ff5053b215d2e6825dad90fcded..9b1f4bd3555d25eebffaf229537a81ba86753451 100644
--- a/test/mjsunit/allocation-site-info.js
+++ b/test/mjsunit/allocation-site-info.js
@@ -148,8 +148,12 @@ if (support_smi_only_arrays) {
     assertKind(elements_kind.fast_double, obj);
     obj = fastliteralcase([3, 6, 2], 1.5);
     assertKind(elements_kind.fast_double, obj);
+
+    // Note: thanks to pessimistic transition store stubs, we'll attempt
+    // to transition to the most general elements kind seen at a particular
+    // store site. So, the elements kind will be double.
     obj = fastliteralcase([2, 6, 3], 2);
-    assertKind(elements_kind.fast_smi_only, obj);
+    assertKind(elements_kind.fast_double, obj);
   }
 
   // Verify that we will not pretransition the double->fast path.