[api] Introduce fast instantiations cache

src/heap/object-stats.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/heap/object-stats.h"
 
 #include "src/counters.h"
 #include "src/heap/heap-inl.h"
 #include "src/isolate.h"
 #include "src/macro-assembler.h"
@@ skipping 447 matching lines @@
 void ObjectStatsCollector::RecordFixedArrayDetails(FixedArray* array) {
   if (array->IsContext()) {
     RecordFixedArrayHelper(nullptr, array, CONTEXT_SUB_TYPE, 0);
   }
   if (IsCowArray(heap_, array) && CanRecordFixedArray(heap_, array)) {
     stats_->RecordFixedArraySubTypeStats(array, COPY_ON_WRITE_SUB_TYPE,
                                          array->Size(), 0);
   }
   if (array->IsNativeContext()) {
     Context* native_ctx = Context::cast(array);
-    RecordHashTableHelper(array, native_ctx->template_instantiations_cache(),
-                          TEMPLATE_INSTANTIATIONS_CACHE_SUB_TYPE);
+    RecordHashTableHelper(array,
+                          native_ctx->slow_template_instantiations_cache(),
+                          SLOW_TEMPLATE_INSTANTIATIONS_CACHE_SUB_TYPE);
+    FixedArray* fast_cache = native_ctx->fast_template_instantiations_cache();
+    stats_->RecordFixedArraySubTypeStats(
+        fast_cache, FAST_TEMPLATE_INSTANTIATIONS_CACHE_SUB_TYPE,
+        fast_cache->Size(), 0);
   }
 }
 
 }  // namespace internal
 }  // namespace v8