SMC/Mtrack: Add shm, mremap, madvise support 
shmat, mremap are not tracked for smc.

Tests: https://github.com/FEX-Emu/fex-assorted-tests-bins/blob/main/src/smc-2.cpp

Looks like the shm size would have to be queried on map / unmap, similar to the tracking the 32-bit allocator does.