RFR: Re-label Shenandoah GC causes (SA&GC)

[Aleksey Shipilev]

On 12/4/18 11:51 AM, Roman Kennke wrote:
> As pointed out by Per, let's relabel GC Causes in gc/shared and SA to be
> consistent.
> 
> http://cr.openjdk.java.net/~rkennke/relabel-gccause/webrev.00/

When I was doing this originally, I looked at G1 causes, which have "G1" in their names. I think
dropping "Shenandoah" is more readable though. The patch looks good.

-Aleksey