incr - PLD prefetch hits the first bytes of cache lines
wrap - PLD prefetch hist the last bytes of cache lines

This can expose Raspberry Pi performance issues related to
wrap cache linefills.

Now the compilers should have no chance to mess up latency
measurement loops by adding unwanted memory accesses.

The compilers should be a bit less likely to spill variables to stack.

Checks how the processor can handle outstanding cache misses.