review request (S): 6966222: G1: simplify TaskQueue overflow handling

[John Coomes]

I (John.Coomes at oracle.com) wrote:
> I'd appreciate reviews of the changes to simplify TaskQueue overflow
> handling in G1.
> 
> 	http://cr.openjdk.java.net/~jcoomes/6966222-taskqueue-g1/

I updated the webrev; the main difference is to format the output as a
table.  See the webrev comments for more details.

I'd particularly like people to verify that the change in the duration
that the stats_lock() is held is correct (g1CollectedHeap.cpp).

> The changes are limited to 2 files, and more lines were deleted than
> added :-).

Unfortunately, the above two statements are no longer accurate :-(.

-John