Revert of Turn StoreIC::Megamorphic into a builtin, get rid of the non-monomorphic-cache

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 1115882c4183177e057c0ae7e3a67b7574a5447a..5c2d5786099bff15cd894eea21f08693bd4dc0cf 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -2695,6 +2695,10 @@
   // expanding the dictionary during bootstrapping.
   set_code_stubs(*UnseededNumberDictionary::New(isolate(), 128));
 
+  // Create the non_monomorphic_cache used in stub-cache.cc. The initial size
+  // is set to avoid expanding the dictionary during bootstrapping.
+  set_non_monomorphic_cache(*UnseededNumberDictionary::New(isolate(), 64));
+
   set_instanceof_cache_function(Smi::FromInt(0));
   set_instanceof_cache_map(Smi::FromInt(0));
   set_instanceof_cache_answer(Smi::FromInt(0));
@@ -2897,6 +2901,7 @@
     case kInstanceofCacheMapRootIndex:
     case kInstanceofCacheAnswerRootIndex:
     case kCodeStubsRootIndex:
+    case kNonMonomorphicCacheRootIndex:
     case kEmptyScriptRootIndex:
     case kSymbolRegistryRootIndex:
     case kScriptListRootIndex: