Patch for JDK Bug 8173620

[can comert]

Hello everyone,

I have created a commit for fixing the JDK Bug 8173620 which is documented
here:
https://bugs.openjdk.java.net/browse/JDK-8173620

Here is content for the commit for fixing the "Should not reach here" error
in case of the call to underlying Proxy implementation throws an exception:
https://github.com/AdoptOpenJDK/openjdk-jdk8u/pull/4/commits/d6e6370baad78dfaf34003bb8642f1a5cc9fa064

I have not created a Mercury patch for that but before going down on that
road,
I would like to ask what is the acceptability of this patch and is it
possible to apply this into next Bug fix version for Java 8?

If it is possible and you can accept the change then I can create a Mercury
patch with same or similar content.

Best Regards,
Can Cömert
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