v2 rcutorture updates for 3.12

Hello!

This series provides some rcutorture updates:

1. Add a debug_object option to rcutorture to allow testing
of RCU's debug-objects facilities.

2. Increase rcutorture test coverage by concurrently testing
synchronous, asynchronous, and expedited grace periods.

3. Sort the extensive list of rcutorture module parameters.

4. Remove the unused "oldbatch" variable.

5. Emit CPU-online failure message to the console.

Changes since v1 (https://lkml.org/lkml/2013/8/17/118):

o Interleave variable and corresponding module-parameter
declarations, as suggested by Josh Triplett.

o Fix comparison to zero and in-function #ifdef, again as
suggested by Josh Triplett.

Thanx, Paul

 b/Documentation/RCU/torture.txt |   10 +
 b/kernel/rcutorture.c           |  382 +++++++++++++++++-----------------------
 2 files changed, 174 insertions(+), 218 deletions(-)