RFR: 8365047: Remove exception handler stub code in C2

[Andrew Dinn]

On Thu, 7 Aug 2025 15:49:20 GMT, Ruben <duke at openjdk.org> wrote:

> 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code, the exception handler stub code used to be patched upon deoptimization, however presumably these comments are outdated as the patching upon deoptimization happens for post-call NOPs only.

Looks ok to me.

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Marked as reviewed by adinn (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/26678#pullrequestreview-3105309380