[api] Introduce fast instantiations cache

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index 181c20052734e217138906ee13d72c53a2e8c613..c32685649d6127715b32defaf3f172d3c4e72b71 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -2990,11 +2990,15 @@ bool Genesis::InstallNatives(GlobalContextType context_type) {
   }
 
   if (!CallUtilsFunction(isolate(), "PostNatives")) return false;
+  auto fast_template_instantiations_cache = isolate()->factory()->NewFixedArray(
+      TemplateInfo::kFastTemplateInstantiationsCacheSize);
+  native_context()->set_fast_template_instantiations_cache(
+      *fast_template_instantiations_cache);
 
-  auto template_instantiations_cache = UnseededNumberDictionary::New(
+  auto slow_template_instantiations_cache = UnseededNumberDictionary::New(
       isolate(), ApiNatives::kInitialFunctionCacheSize);
-  native_context()->set_template_instantiations_cache(
-      *template_instantiations_cache);
+  native_context()->set_slow_template_instantiations_cache(
+      *slow_template_instantiations_cache);
 
   // Store the map for the %ObjectPrototype% after the natives has been compiled
   // and the Object function has been set up.