RFR: 8286669: Replace MethodHandle specialization with ASM in mainline

[Jorn Vernee]

On Thu, 12 May 2022 17:17:37 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

> Hi,
> 
> This PR brings over commits from the panama-foreign repo. These commits mostly pertain to the switch to ASM and away from MethodHandle combinators for the binding recipe specialization. But, there is one more commit which adds freeing of downcall stubs, since those changes were mostly Java as well.
> 
> Thanks,
> Jorn

Hmm, looks like there's an unexpected a tier1 failure on SysV in the GHA (I only tested Windows locally, since these changes have been live in the panama repo for a while now...). Will convert back to draft and see what's up.

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PR: https://git.openjdk.java.net/jdk/pull/8685