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

src/heap.cc

Index: src/heap.cc
===================================================================
--- src/heap.cc	(revision 3428)
+++ src/heap.cc	(working copy)
@@ -3907,8 +3907,8 @@
 int KeyedLookupCache::Hash(Map* map, String* name) {
   // Uses only lower 32 bits if pointers are larger.
   uintptr_t addr_hash =
-      static_cast<uint32_t>(reinterpret_cast<uintptr_t>(map)) >> 2;
-  return (addr_hash ^ name->Hash()) % kLength;
+      static_cast<uint32_t>(reinterpret_cast<uintptr_t>(map)) >> kMapHashShift;
+  return (addr_hash ^ name->Hash()) & kCapacityMask;
 }