vm: implement B_RANDOMIZED_BASE_ADDRESS address specification

B_RAND_BASE_ADDRESS is basically B_BASE_ADDRESS with non-deterministic created
area's base address.

Initial start address is randomized and then the algorithm looks for a large
enough free space in the interval [randomized start, end]. If it fails then
the search is repeated in the interval [original start, randomized start]. In
case it also fails the algorithm falls back to B_ANY_ADDRESS
(B_RANDOMIZED_ANY_ADDRESS when it is implemented) just like B_BASE_ADDRESS does.

Randomization range is limited by kMaxRandomize and kMaxInitialRandomize.
vm: implement B_RANDOMIZED_ANY_ADDRESS address specification

Randomized equivalent of B_ANY_ADDRESS. When a free space is found (as in
B_ANY_ADDRESS) the base adress is then randomized using _RandomizeAddress
pretty much like it is done in B_RANDOMIZED_BASE_ADDRESS.