Tweak behavior of atomic memory transactions
Tweak behavior of atomic memory transactions

load_sync should always acquire the cache line in the exclusive state
store_sync cannot generate a cache miss.  If the line has been evicted, it should fail.

hoangt/NyuziProcessor,hoangt/NyuziProcessor,hoangt/NyuziProcessor,FulcronZ/NyuziProcessor,jbush001/NyuziProcessor,FulcronZ/NyuziProcessor,FulcronZ/NyuziProcessor,jbush001/NyuziProcessor,FulcronZ/NyuziProcessor,jbush001/NyuziProcessor,jbush001/NyuziProcessor,hoangt/NyuziProcessor,jbush001/NyuziProcessor,jbush001/NyuziProcessor