RFR: 8276066: Reset LoopPercentProfileLimit for x86 due to suboptimal performance

[Jatin Bhateja]

On Thu, 28 Oct 2021 08:34:09 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

> Just for the record, `LoopPercentProfileLimit` was always set to `30` on x86: http://hg.openjdk.java.net/jdk9/jdk9/hotspot/rev/5fefcbeda616#l6.7
> 
I am already working on optimizing post loop vectorization using vectorAPI masked operations and plan to enhance [SLP post loop ](https://bugs.openjdk.java.net/browse/JDK-8183390) after it.

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PR: https://git.openjdk.java.net/jdk/pull/6142