RFR: 8289071: Compute stub sizes outside of locks

[Evgeny Astigeevich]

On Fri, 24 Jun 2022 00:05:25 GMT, Yi-Fan Tsai <duke at openjdk.org> wrote:

> 8289071: Compute stub sizes outside of locks

Could you please add the description of your changes?
It would be very useful if the description briefly gives:
- What the problem is.
- What the solution is.
- How you tested them.

No need to copy all details from JDK-8289071, just enough to understand the context of the changes.

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PR: https://git.openjdk.org/jdk/pull/9266