Install the 'name' property in classes at runtime

src/parsing/preparser.h

Index: src/parsing/preparser.h
diff --git a/src/parsing/preparser.h b/src/parsing/preparser.h
index 197c65a73209cf33c60f9fa02878a40893927567..ce94def6e7dbfc96a367c522215ea5449cd11795 100644
--- a/src/parsing/preparser.h
+++ b/src/parsing/preparser.h
@@ -68,6 +68,9 @@ class PreParserIdentifier {
   static PreParserIdentifier Async() {
     return PreParserIdentifier(kAsyncIdentifier);
   }
+  static PreParserIdentifier Name() {
+    return PreParserIdentifier(kNameIdentifier);
+  }
   bool IsEmpty() const { return type_ == kEmptyIdentifier; }
   bool IsEval() const { return type_ == kEvalIdentifier; }
   bool IsArguments() const { return type_ == kArgumentsIdentifier; }
@@ -80,6 +83,7 @@ class PreParserIdentifier {
   bool IsConstructor() const { return type_ == kConstructorIdentifier; }
   bool IsEnum() const { return type_ == kEnumIdentifier; }
   bool IsAwait() const { return type_ == kAwaitIdentifier; }
+  bool IsName() const { return type_ == kNameIdentifier; }
 
   // Allow identifier->name()[->length()] to work. The preparser
   // does not need the actual positions/lengths of the identifiers.
@@ -105,7 +109,8 @@ class PreParserIdentifier {
     kConstructorIdentifier,
     kEnumIdentifier,
     kAwaitIdentifier,
-    kAsyncIdentifier
+    kAsyncIdentifier,
+    kNameIdentifier
   };
 
   explicit PreParserIdentifier(Type type) : type_(type), string_(nullptr) {}
@@ -1142,6 +1147,10 @@ class PreParser : public ParserBase<PreParser> {
     return identifier.IsConstructor();
   }
 
+  V8_INLINE bool IsName(PreParserIdentifier identifier) const {
+    return identifier.IsName();
+  }
+
   V8_INLINE static bool IsBoilerplateProperty(PreParserExpression property) {
     // PreParser doesn't count boilerplate properties.
     return false;