8u: RFR(S): 8197943: Unable to use JDWP API in JDK 8 to debug JDK 9 VM

[Langer, Christoph]

Hi JDK 8 reviewers,

I'd like to propose a fix for a backport of JDI changes that came with modularization.

Egor has brought this up in 8u-dev: http://mail.openjdk.java.net/pipermail/jdk8u-dev/2018-February/007230.html

The fix is straightforward and is used by Egor in JetBrains, as well as we at SAP have this already patched for a while in our JDK8 port.

Bug: https://bugs.openjdk.java.net/browse/JDK-8197943
Webrev: http://cr.openjdk.java.net/~clanger/webrevs/8197943.0/

The build went through fine and jtreg tests are running.

@Stephen: In the bug I read that you wanted to backport this. I hope this matches your intentions. Otherwise I'd step back and wait for your proposal...

Best regards
Christoph

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