RFR: JDK-8260625: Rename MetaspaceExpand_lock

[Aleksey Shipilev]

On Fri, 29 Jan 2021 06:40:49 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> Hi, may I have reviews please for this trivial change:
> 
> MetaspaceExpand_lock is a potentially confusing misnomer for the casual code reader, since it does not only guard metaspace expansion but guards access to all central metaspace structures for expansion, reclamation, access to freelist etc. 
> 
> With this patch it is renamed to the more generic "Metaspace_lock".
> 
> Thanks, Thomas

Looks fine to me.

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Marked as reviewed by shade (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/2308