[lilliput-jdk17u:lilliput] RFR: 8310944: [Lilliput/JDK17] Streamline and cleanup GC code [v2]

[Roman Kennke]

On Thu, 29 Jun 2023 14:13:51 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

>> src/hotspot/share/oops/oop.inline.hpp line 303:
>> 
>>> 301:     set_mark(forward_safe_klass()->prototype_header());
>>> 302:   } else {
>>> 303:     set_mark(markWord::prototype());
>> 
>> This thing is used from `PreservedMarks::init_forwarded_mark`, which in current 17u upstream calls `oopDesc::init_mark`, which then calls: `  set_mark(markWord::prototype_for_klass(klass()));`.
>> 
>> So, does this miss the +BiasedLocking mark prototype?
>
> Right. In-fact, this means we can just fix init_mark() and use that.

Actually, no. We need to resolve the forwardee.

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PR Review Comment: https://git.openjdk.org/lilliput-jdk17u/pull/50#discussion_r1246684614