Probe keyed load cache in generic keyed load stub....

src/serialize.cc

Index: src/serialize.cc
===================================================================
--- src/serialize.cc	(revision 3428)
+++ src/serialize.cc	(working copy)
@@ -485,6 +485,16 @@
       21,
       "NativeRegExpMacroAssembler::GrowStack()");
 #endif
+  // Keyed lookup cache.
+  Add(ExternalReference::keyed_lookup_cache_keys().address(),
+      UNCLASSIFIED,
+      22,
+      "KeyedLookupCache::keys()");
+  Add(ExternalReference::keyed_lookup_cache_field_offsets().address(),
+      UNCLASSIFIED,
+      23,
+      "KeyedLookupCache::field_offsets()");
+
 }