RFR: JDK-8075816: Deprecate AliasLevel flag since it is broken [v2]

[Tobias Holenstein]

On Tue, 12 Apr 2022 05:42:52 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

>> Tobias Holenstein has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Obsolete AliasLevel flag
>
> From looking at the code and history, it seems that `AliasLevel` values `0` and `1` are currently disabled due to issues. The VM will print:
> 
> AliasLevel (1) is not compatible with -Xcomp or -Xmixed
> Error: Could not create the Java Virtual Machine.
> Error: A fatal exception has occurred. Program will exit.
> 
> 
> But `2` seems to work fine. `3` is the default. @tobiasholenstein did you find any issues with `AliasLevel=2`?

thanks @TobiHartmann and @vnkozlov for the reviews!

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PR: https://git.openjdk.java.net/jdk/pull/8140