Bug fix: JVM crashes when running with -Xdebug option

[Edward Nevill]

Hi Shanyao,

Thanks for finding this. I have verified your fix and pushed the change.

Regards,
Ed.

On Thu, 2015-12-31 at 18:35 +0800, Shanyao Chen wrote:
> hi,all:
>      There is a bug in jdk9 aarch32 when using jdb. And it is
> described as belowing:
> 
> When running any case by the following command,
>     java -Xdebug
> -Xrunjdwp:transport=dt_socket,address=localhost:8787,server=y,suspend=y
> test
> the jvm throws an error message "registers must be different: a=" r2
> ", b=" r0", c=" r0""