Use INIT_LIST_HEAD_RCU to avoid compiler optimization too much
in some case.

Signed-off-by: Yang Sheng <ys@whamcloud.com>
Change-Id: I66b340ac3147d2cb911a2b7d3e210c6847047dac
Reviewed-on: https://review.whamcloud.com/33317


Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Tested-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: John L. Hammond <jhammond@whamcloud.com>