RFR: 8365047: Remove exception handler stub code in C2 [v9]

[Andrew Haley]

On Thu, 30 Oct 2025 21:10:18 GMT, Dean Long <dlong at openjdk.org> wrote:

> Re: SafeFetch, it is probably OK to make NativePostCallNop_at slightly slower for uses like make_deoptimized(), but the oopmap optimizations like CodeCache::find_blob_and_oopmap() were highly optimized to make loom/VirtualThread performance reasonable. Adding a SafeFetch here might cause a regression.

Sure, but 2 things:
Loom doesn't meed post-call NOPs as much as it used to.
We could fairly easily make SafeFetch much faster than it is, if needs be.
But anyway, I approved this patch.

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PR Comment: https://git.openjdk.org/jdk/pull/26678#issuecomment-3476017720