Revert "Revert "Reland 21774: Generate KeyedLoadGeneric with Hydrogen""

src/heap.h

Index: src/heap.h
diff --git a/src/heap.h b/src/heap.h
index ccf212b4ed6726d5f355f135a9fa0ab7d0ccdeec..7d9233b30af6de7d2f21cb0d4ad4460d635c9ded 100644
--- a/src/heap.h
+++ b/src/heap.h
@@ -2404,6 +2404,9 @@ class KeyedLookupCache {
   static const int kMapHashShift = 5;
   static const int kHashMask = -4;  // Zero the last two bits.
   static const int kEntriesPerBucket = 4;
+  static const int kEntryLength = 2;
+  static const int kMapIndex = 0;
+  static const int kKeyIndex = 1;
   static const int kNotFound = -1;
 
   // kEntriesPerBucket should be a power of 2.