RFR: 8342826: Improve performance of oopDesc::klass() after JDK-8305895

[Roman Kennke]

On Thu, 14 Nov 2024 08:31:26 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

> Could you make an experiment where you just force-inline `oopDesc::klass()` with `ALWAYSINLINE` and compare that to the proposed patch? When I investigated one regression a non-inlined `klass()` was prominent in the JEP-450 code but not in the baseline.

Force-inlining doesn't help at all. dacapo:pmd scores at 737.51ms, which is about what I currently see in mainline.

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PR Comment: https://git.openjdk.org/jdk/pull/22020#issuecomment-2476066500