Ensures the top of the loop is 16byte aligned to give Cortex's
prefetcher the best chance of loading the code.
If the address size is a power of two (We always do 64GB or 32GB VM atm)
then do the address size masking in one instruction instead of loading a
64bit constant first
Move some accessed constants to a literal pool at the end of the ASM
dispatcher.
Ryan Houdek
cf5afbcd8d