RFR: 8286897: Loom: Cleanup x86_64 StubGenerator [v3]

[Aleksey Shipilev]

On Wed, 18 May 2022 16:23:37 GMT, Ron Pressler <rpressler at openjdk.org> wrote:

> You generally need to test `jdk/internal/vm/Continuation/` for all continuation-related stuff, but those are in tier1, I think.

I did test groups from #8765 on Linux x86_64, and they still pass.

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PR: https://git.openjdk.java.net/jdk/pull/8755