RFR: 8340801: Disable ubsan checks in some awt/2d coding [v4]

[Sergey Bylokhov]

On Wed, 9 Oct 2024 07:50:20 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

>> There is some old awt/2d coding where warnings occur when running with ubsan enabled binaries.
>> However at most of these locations the coding should work (at least on our supported platform set) so the warnings can be disabled at least for now.
>> 
>> The change adds a macro ATTRIBUTE_NO_UBSAN  similar to what we already use in Hotspot coding.
>
> Matthias Baesken has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:
> 
>  - Merge remote-tracking branch 'origin/master' into JDK-8340801
>  - move ub.h to a better location
>  - remove ubsan changes from jni_md.h
>  - JDK-8340801

Can you please add a comment to the jbs - what warning is actually fixed by this change, and how to reproduce that?

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PR Comment: https://git.openjdk.org/jdk/pull/21184#issuecomment-2412583603