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

[Pengfei Li]

On Mon, 3 Jul 2023 14:42:03 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

>> I will try to do this in another JBS and come back here later.
>
> That would be fantastic!

`SWPointer` is already moved out from `SuperWord` in [JDK-8312332](https://bugs.openjdk.org/browse/JDK-8312332). We will move `_vector_loop_debug` out in a later refactoring patch.

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PR Review Comment: https://git.openjdk.org/jdk/pull/14581#discussion_r1338266329