1) Increased the log message buffer size.
1) Added report() as a global function in JavaScript.
1) Replaced the nano timer with the clock tick getter.
2) Modified log/print messages to print in the unit of ticks.
3) Added runtime functions to estimate the overhead of the nano timer and the clock tick getter.
4) Modified --log-vm-timer to report every log period.
5) Despite --disable-vm-state-* flags, the number of enterance into IC_RUNTIME and RUNTIME states are counted.