RFR: Avoid jtreg test timeout in aarch64 due to a stackoverflow in process reaper

[Martin Buchholz]

On Sun, May 10, 2020 at 7:20 PM Jie He
<github.com+10233373+jhe33 at openjdk.java.net> wrote:

> yes, Martin, I have reported an issue to llvm/tsan. with tsan enabled, it reduces the effiective usable stack size.

I have always thought that when the JVM is asked to create a thread
with some stack size, then the JVM should try hard to ensure that all
the requested space is usable for java stack frames, i.e. nothing is
deducted for "overhead".

The spirit of Java (portability and reliability) hasn't reached stack
space calculations yet.