RFR 8137296: [JVMCI] Enable sharing of debug info by default in all configurations

[Christian Thalinger]

Looks good.

> On May 10, 2016, at 8:06 AM, Tom Rodriguez <tom.rodriguez at oracle.com> wrote:
> 
> http://cr.openjdk.java.net/~never/8137296/webrev
> 
> This webrev makes the JVMCI logic for sharing of debug info the default for all configurations.  The code has been the default for quite a while with no issues so it makes sense to eliminate the old code.
> 
> tom