[master] RFR: Implement self-forwarding of objects that preserves header bits [v2]

[Aleksey Shipilev]

On Wed, 7 Jul 2021 20:06:46 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

>> src/hotspot/share/oops/markWord.hpp line 135:
>> 
>>> 133:   static const uintptr_t marked_value             = 3;
>>> 134: 
>>> 135:   static const uintptr_t self_forwarded_value     = 1 << self_forwarded_shift;
>> 
>> This actually looks like `self_forwarded_in_place`? Because `self_forwarded_value` is just `1`.
>
> It's actually self_forwarded_mask_in_place, I removed the _value and simplified the set_self_forwarded() method.

Good.

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PR: https://git.openjdk.java.net/lilliput/pull/10