Move object literal checking into checker classes

src/ast.cc

Index: src/ast.cc
diff --git a/src/ast.cc b/src/ast.cc
index 7369e75ea1558c7d5b5d2a692b97d2f263ecd5c7..4280a983649608aae812c1b9d260f83ca4581d49 100644
--- a/src/ast.cc
+++ b/src/ast.cc
@@ -239,7 +239,6 @@ void ObjectLiteral::CalculateEmitStore(Zone* zone) {
 
   ZoneHashMap table(Literal::Match, ZoneHashMap::kDefaultHashMapCapacity,
                     allocator);
-  bool seen_prototype = false;
   for (int i = properties()->length() - 1; i >= 0; i--) {
     ObjectLiteral::Property* property = properties()->at(i);
     if (property->is_computed_name()) continue;
@@ -252,13 +251,7 @@ void ObjectLiteral::CalculateEmitStore(Zone* zone) {
          property->kind() == ObjectLiteral::Property::COMPUTED) &&
         table.Lookup(literal, hash, false, allocator) != NULL) {
       property->set_emit_store(false);
-    } else if (property->kind() == ObjectLiteral::Property::PROTOTYPE) {
-      // Only emit a store for the last prototype property. Make sure we do not
-      // clobber the "__proto__" name for instance properties (using method or
-      // literal shorthand syntax).
-      property->set_emit_store(!seen_prototype);
-      seen_prototype = true;
-    } else {
+    } else if (property->kind() != ObjectLiteral::Property::PROTOTYPE) {
       // Add key to the table.
       table.Lookup(literal, hash, true, allocator);
     }