RFR: 8297201: Obsolete AliasLevel flag

Thu Nov 17 12:37:14 UTC 2022

On Thu, 17 Nov 2022 11:57:02 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

> The AliasLevel flag was deprecated in JDK 19 by [JDK-8075816](https://bugs.openjdk.org/browse/JDK-8075816) and should now be obsoleted. Patch is slightly adjusted https://github.com/openjdk/jdk/pull/8140/commits/6a1bed2d7ed5494b051fae09d28787fd01de9635, originally from @tobiasholenstein.
> 
> Thanks,
> Tobias

I think `do_aliasing()` is always true in `*Compile::flatten_alias_type( const TypePtr *tj )` because `flatten_alias_type` is only called in the `Compile::find_alias_type(..)` function after we checked that `do_aliasing()` is true.

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PR: https://git.openjdk.org/jdk/pull/11207