RFR: 8297036: Generalize C2 stub mechanism [v7]

[Roman Kennke]

On Tue, 6 Dec 2022 09:46:19 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

>> Currently, we have two implementations of out-of-line stubs in C2, one for safepoint poll stubs (C2SafepointPollStubTable in output.hpp) and another for nmmethod entry barriers (C2EntryBarrierStubTable in output.hpp). I will need a few more for Lilliput: One for checking lock-stack size in method prologue, one for handling lock failures (both for fast-locking), and another one for load-klass slow-path. It would be good to generalize the mechanism and consolidate the existing uses on the new general mechanism.
>> 
>> Testing:
>>  - [x] tier1 (x86_64, x86_32, aarch64)
>>  - [x] tier2 (x86_64, x86_32, aarch64)
>>  - [x] tier3 (x86_64, x86_32, aarch64)
>
> Roman Kennke has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Relax size-check in C2CodeStubList::emit()

I need somebody to run this on PPC to figure out the actual stub size for C2SafepointPollStub. @tstuefe could you try this? Thanks!

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PR: https://git.openjdk.org/jdk/pull/11188