[jdk11u-dev] RFR: 8267396: Avoid recording "pc" in unhandled oops detector for better performance

[Paul Hohensee]

On Fri, 25 Jun 2021 12:39:15 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> This improves the performance under `-XX:+CheckUnhandledOops`. Backport is unclean, because `Thread::is_in_stack` was renamed to `Thread::is_in_live_stack` by [JDK-8238988](https://bugs.openjdk.java.net/browse/JDK-8238988).
> 
> Additional testing:
>  - [ ] `tier1` with `-XX:+CheckUnhandledOops`

There are four linked issues. I recommend backporting them too, and pushing them together.

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PR: https://git.openjdk.java.net/jdk11u-dev/pull/71