RFR: 8274738: ZGC: Use relaxed atomic load when reading bits in the live map

[Stefan Karlsson]

On Mon, 4 Oct 2021 18:18:11 GMT, Per Liden <pliden at openjdk.org> wrote:

> `ZLiveMap::get()` currently uses a non-atomic load to read bits in the live map. This should really be an relaxed atomic load.

Marked as reviewed by stefank (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/5809