crash with -Xjcov and union types

[Joel Borggrén-Franck]

Hi Liam,

On 25 Sep 2014, at 23:57, Liam Miller-Cushon <cushon at google.com> wrote:

> I'm seeing crashes with -Xjcov enabled while compiling code with union types. This seems to affect javac 7 through 9. I've attached a possible fix, and a jtreg test for the crash.
> 
> Repro:
> 

Thanks for the report and fix! I have filed https://bugs.openjdk.java.net/browse/JDK-8059453

I don’t know enough about -Xjcov to review and commit your fix right now, but I’ll try to make this happen soon.

cheers
/Joel