RFR: 8183390: Fix and re-enable post loop vectorization [v8]

[Pengfei Li]

On Tue, 5 Apr 2022 22:33:19 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

> Testing passed.

Thanks @vnkozlov . I will integrate this.

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PR: https://git.openjdk.java.net/jdk/pull/6828