RFR: 8341168: Cleanup dead code after JDK-8322630 [v2]

[Aleksey Shipilev]

On Mon, 30 Sep 2024 08:13:10 GMT, Axel Boldt-Christmas <aboldtch at openjdk.org> wrote:

>> [JDK-8322630](https://bugs.openjdk.org/browse/JDK-8322630) / #17495 removed the the concept of ICStubs, InlineCache buffers and related safepoints.
>> 
>> There are a handfull of references and auxiliary constructs still in the code, I propose we clean these out.
>> 
>> This removes the unused:
>>  * Experimental `InlineCacheBufferSize` option
>>  * `InlineCacheBuffer_lock` mutex
>>  * `Thread::_missed_ic_stub_refill_verifier` field
>>  * `VM_ICBufferFull` VM operation
>
> Axel Boldt-Christmas has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add newline

OK, looks fine.

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Marked as reviewed by shade (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/21255#pullrequestreview-2336702247