GT_CPUMstrCtl_CleanBlock
cpumstr &= ~(GT_CPUMstrCtl_CleanBlock|GT_CPUMstrCtl_FlushBlock);
switch (cpumstr & (GT_CPUMstrCtl_CleanBlock|GT_CPUMstrCtl_FlushBlock)) {
case GT_CPUMstrCtl_CleanBlock: aprint_normal(", snoop=clean"); break;
case GT_CPUMstrCtl_CleanBlock|GT_CPUMstrCtl_FlushBlock: