hg: jdk/submit15: 8249367: JShell uses 100% of one core all the time

[jan.lahoda at oracle.com]

Changeset: 244298608b49
Author:    jlahoda
Date:      2020-07-16 11:30 +0200
URL:       https://hg.openjdk.java.net/jdk/submit15/rev/244298608b49

8249367: JShell uses 100% of one core all the time
Summary: Workarounding busy wait while reading from NonBlocking.NonBlockingReaderInputStream wrapping NonBlockingPumpReader.
Reviewed-by: rfield, cstein

! src/jdk.jshell/share/classes/jdk/internal/jshell/tool/StopDetectingInputStream.java