RFR: 8323122: AArch64: Increase itable stub size estimate

[Yude Lin]

On Sat, 13 Jan 2024 18:11:16 GMT, Andrew Haley <aph at openjdk.org> wrote:

>> Since [JDK-8307352](https://bugs.openjdk.org/browse/JDK-8307352), itable stub size has grown by 20 bytes on linux-aarch64. In particular, the "slop-counted" code increases from 100->120 bytes, where the current estimate is 124 bytes. I haven't found a case where it exceeds the estimate. For now this size is stable across the few linux-aarch64 configurations I ran with. It doesn't vary (for example) by different klass decoding schemes. But I think the idea of the estimate is that we can never know. I propose we increase the estimate to be safe.
>> 
>> Passed hotspot/jtreg/:tier1
>
> Marked as reviewed by aph (Reviewer).

@theRealAph Do you mind sponsoring this change? Thank you.

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PR Comment: https://git.openjdk.org/jdk/pull/17336#issuecomment-1891365720