RFR: Fix counter inccurate when creating platform/virtual thread by Thread…

[Alan Bateman]

On Fri, 4 Jun 2021 06:41:03 GMT, Miao Zheng <github.com+20216587+miao-zheng at openjdk.org> wrote:

> Fix counter inccurate when creating platform/virtual thread by ThreadBuilder using mutiple threads

A builder is not meant to be thread-safe. The ThreadFactory returned by the factory method is thread-safe.

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PR: https://git.openjdk.java.net/loom/pull/45