Simplify and unify PolymorphicStoreNameFeild

src/apinatives.js

Index: src/apinatives.js
diff --git a/src/apinatives.js b/src/apinatives.js
index ccbedd6d397455aa18f2b26bcda172683ba750c7..732eb929637b0b620896ce9a51722c60ae236e7c 100644
--- a/src/apinatives.js
+++ b/src/apinatives.js
@@ -42,6 +42,7 @@ var functionCache = kApiFunctionCache;
 
 
 function Instantiate(data, name) {
+            %DebugBreak();
   if (!%IsTemplate(data)) return data;
   var tag = %GetTemplateField(data, kApiTagOffset);
   switch (tag) {
@@ -79,6 +80,7 @@ function InstantiateFunction(data, name) {
       var flags = %GetTemplateField(data, kApiFlagOffset);
       // Note: Do not directly use an object template as a condition, our
       // internal ToBoolean doesn't handle that!
+            %DebugBreak();
       fun.prototype = typeof prototype === 'undefined' ?
           {} : Instantiate(prototype);
       if (flags & (1 << kReadOnlyPrototypeBit)) {