cputlb: modernise the debug support

cputlb: modernise the debug support

To avoid cluttering the code with #ifdef legs we wrap up the print
statements into a tlb_debug() macro. As access to the virtual TLB can
get quite heavy defining DEBUG_TLB_LOG will ensure all the logs go to
the qemu_log target of CPU_LOG_MMU instead of stderr. This remains
compile time optional as these debug statements haven't been considered
for usefulness for user visible logging.

I've also removed DEBUG_TLB_CHECK which wasn't used.

Signed-off-by: Alex Bennée <[email protected]>
Reviewed-by: Richard Henderson <[email protected]>
Message-Id: <1458052224[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>