[13u] RFR: 8232080: jlink plugins for vendor information and command-line options

[Yuri Nesterenko]

Hi,

I would like to port this change to openjdk13u. It is already in 11u.
Unlike 11u, the original change applies smoothly here: the only file I have to
slightly modify because of context difference is src/hotspot/share/classfile/classLoader.cpp.

Bug: https://bugs.openjdk.java.net/browse/JDK-8232080
Original change: https://hg.openjdk.java.net/jdk/jdk/rev/6c255334120d
Webrev: http://cr.openjdk.java.net/~yan/8232080/webrev.0/

There will be several follow-ups such as
JDK-8233137, JDK-8233291, JDK-8234696, JDK-8239557
mentioned in the thread around
https://mail.openjdk.java.net/pipermail/jdk-updates-dev/2020-April/003001.html
as far as I see, all of the corresponding patches apply perfectly after JDK-8232080 fix.

Tier1 fastdebug run (for 8233137 etc.) finished fine (with all patches in place).
More thorough series of testing will be performed in the promotion runs.

Thanks,
--yan