RFR: 8308994: C2: Re-implement experimental post loop vectorization [v4]

[Pengfei Li]

On Mon, 3 Jul 2023 08:09:30 GMT, Pengfei Li <pli at openjdk.org> wrote:

>> I'd also move this to some static functions in a potential "autovectorization.hpp", and move `_vector_loop_debug` there, together with all its `is_trace...` accessors.
>
> I agree current code here is a bit ugly. I will try to make it better in `SWPointer` refactoring.

Close above comment and leave this open to remind that we should also move `_vector_loop_debug` and all `is_trace...` accessors in a later patch.

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PR Review Comment: https://git.openjdk.org/jdk/pull/14581#discussion_r1338271886