RFR: 8285364: Remove REF_ enum for java.lang.ref.Reference [v3]

[Albert Mingkun Yang]

On Wed, 27 Apr 2022 12:35:56 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Yes, I was also surprised by this. The java.lang.ref.Reference Klass is only an InstanceKlass, not an InstanceRefKlass.
>
> Yeah, please add a short comment in the is_java_lang_ref_Reference_subclass function that this is the case, now that we've learned this.

Instead of documenting this surprise, how about removing it by extending this method to cover all subtypes of `j.l.r.Reference`? 


bool ClassFileParser::is_java_lang_ref_Reference_or_subclass() const {
  if (_super_klass == NULL) {
    return false;
  }

  if (_class_name == vmSymbols::java_lang_ref_Reference()) {
    return true;
  }

  if (_super_klass->name() == vmSymbols::java_lang_ref_Reference()) {
    return true;
  }

  return _super_klass->reference_type() != REF_NONE;
}

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PR: https://git.openjdk.java.net/jdk/pull/8332