Investigate low hit rate on {MT0, MT1, MT2}-canneal

[0mega28]

with TLB_SIZE 1024 and NUM_OF_WAYS 8
hit rate is around 26% to 27%

[0mega28]

Increasing TLB_SIZE to 8192 from 1024
and NUM_OF_WAYS to 16 from 8

hit rate changes to 94% for all MT*-canneal input files.