RFR: 8343767: Enumerate StubGen blobs, stubs and entries and generate code from declarations

[Andrew Dinn]

On Wed, 20 Nov 2024 16:30:50 GMT, Andrew Dinn <adinn at openjdk.org> wrote:

>> Ok, it makes sense. As an idea, `StubCodeMark` can be used to hide some of that logic. (As an example, different marks on MacroAssembler mess with its instances to customize their behavior.)
>
> n.b. the latest version has `StubCodeMark` assert that stub id matches the blob id.

I will leave folding in the icache and vm_version blobs for a follow_up PR. This one is already big enough.

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PR Review Comment: https://git.openjdk.org/jdk/pull/21957#discussion_r1850636838