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

[Ruben]

On Fri, 7 Nov 2025 11:07:40 GMT, Ruben <duke at openjdk.org> wrote:

> The original fix [JDK-8365047](https://bugs.openjdk.org/browse/JDK-8365047) was backed out by [JDK-8371388](https://bugs.openjdk.org/browse/JDK-8371388), this is the REDO.
> 
> The C2 exception handler stub code is only a trampoline to the generated exception handler blob. This change removes the extra step on the way to the generated blob.
> 
> According to some comments in the source code, the exception handler stub code used to be patched upon deoptimization, however presumably these comments are outdated as the patching upon deoptimization happens for post-call NOPs only.

This pull request has now been integrated.

Changeset: 21772600
Author:    Ruben Ayrapetyan <ruben.ayrapetyan at arm.com>
Committer: Martin Doerr <mdoerr at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/217726009492af5a1143c98b97cc39b580850c5d
Stats:     640 lines in 46 files changed: 334 ins; 218 del; 88 mod

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

Co-authored-by: Martin Doerr <mdoerr at openjdk.org>
Reviewed-by: mdoerr, dlong

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PR: https://git.openjdk.org/jdk/pull/28192