RFR: 8259068: Streamline class loader locking [v2]

[Coleen Phillimore]

On Fri, 15 Jan 2021 02:38:35 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Nice!
>> 
>> `ClassLoader::sync_systemLoaderLockContentionRate()` becomes unused with this change, so could trivially be removed. The underlying perf counter lives in the unstable, unsupported SUN_CLS namespace and can probably be nuked without a CSR or anything, but that might be good for a follow-up.
>
> Thanks Claes, I'll remove them as a follow up.  Do you know what tools use these?

Reran tier1 and running tier2 and 3.

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PR: https://git.openjdk.java.net/jdk/pull/2071