RFR: 8323595: is_aligned(p, alignof(OopT))) assertion fails in Jetty without compressed OOPs

[Patricio Chilano Mateo]

On Wed, 17 Jan 2024 15:07:04 GMT, Patricio Chilano Mateo <pchilanomate at openjdk.org> wrote:

> This is an oversight in one of the asserts I added as part of the 8320275 fix. Variable `end` cannot be passed to bit_index_for() since it can be unaligned if UseCompressedOops is off. We actually only need `effective_end` in the assert since we only want to check that if `end` was unaligned there is indeed no bit set for that last stack slot of the argument area.
> I run the failing test several times with -XX:-UseCompressedOops. I also run the upper loom tiers with that flag since it seems it's not being tested as much. 
> 
> Thanks,
> Patricio

Thanks Fred and Dean for the reviews!

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PR Comment: https://git.openjdk.org/jdk/pull/17465#issuecomment-1898368900