git: openjdk/loom: fibers: Re-add mistakenly removed enumeratevthreads=y for jdb.

[duke]

Changeset: 474bb185
Author:    Chris Plummer <chris.plummer at oracle.com>
Date:      2022-02-27 04:58:59 +0000
URL:       https://git.openjdk.java.net/loom/commit/474bb1852dd5756af7161d77e16dd0c65b0b03c1

Re-add mistakenly removed enumeratevthreads=y for jdb.

! src/jdk.jdi/share/classes/com/sun/tools/example/debug/tty/TTY.java