RFR: 8371458: [REDO] Remove exception handler stub code in C2

[Ruben]

On Wed, 19 Nov 2025 04:28:04 GMT, Dean Long <dlong at openjdk.org> wrote:

>>> However, I still have not identified a way to ensure the deopt handler stub ends at a page boundary in a unit test.
>> 
>> The latest update implements an alternative way to detect the failure early during testing - via the newly added assertion in the `emit_deopt_handler`.
>> 
>> @adinn, @dean-long, @TheRealMDoerr, would it be possible for you to review the latest version of the PR?
>> 
>> Is there any additional testing you would recommend to perform before this can be integrated?
>
>> Is there any additional testing you would recommend to perform before this can be integrated?
> 
> Oracle likes to make sure the final version passes in our CI.  I got burned last time testing an earlier version and not the final version.

Thank you for the reviews, @dean-long, @adinn, @TheRealMDoerr.
@dean-long, I've updated the patch according to your suggestions - also applied the same to other `nativeInst_*` files except `nativeInst_x86.hpp` as the instruction size is not fixed in this case.

> the final version passes in our CI

If this version of the patch looks suitable, would it be possible to start the CI testing please?

-------------

PR Comment: https://git.openjdk.org/jdk/pull/28192#issuecomment-3560702086