linux-generic: odp_ticketlock.c: performance regression
linux-generic: odp_ticketlock.c: performance regression

When releasing a ticket lock, replace the atomic increment operation with
load-relaxed and store-release as this avaoids an (unnecessary) atomic RMW
operation which is expensive on some architectures.
Add descriptive comments for all ticketlock operations.

Signed-off-by: Ola Liljedahl <6d19e6e0076f8797cfccb58ffb99074265221b72@linaro.org>
Reviewed-by: Bill Fischofer <52f3c909d51cc5d355a68a403df6906b3c1a8f83@linaro.org>
Signed-off-by: Maxim Uvarov <db4d16e02ae2d7493db430203537da8b2e34f290@linaro.org>

kalray/odp-mppa,erachmi/odp,erachmi/odp,nmorey/odp,dkrot/odp,rsalveti/odp,ravineet-singh/odp,rsalveti/odp,rsalveti/odp,ravineet-singh/odp,kalray/odp-mppa,dkrot/odp,kalray/odp-mppa,dkrot/odp,kalray/odp-mppa,nmorey/odp,erachmi/odp,mike-holmes-linaro/odp,ravineet-singh/odp,mike-holmes-linaro/odp,erachmi/odp,kalray/odp-mppa,kalray/odp-mppa,nmorey/odp,rsalveti/odp,kalray/odp-mppa,ravineet-singh/odp,mike-holmes-linaro/odp,mike-holmes-linaro/odp,dkrot/odp,rsalveti/odp,nmorey/odp