Add guest PC values statistics collection and display

[grigory-rechistov]

Add a mechanism to count how often the simulated CPU visits different program addresses by counting PC register values.

Requirements for a solution

• It should only be active when INSTR_STAT macro is defined. I.e., it should be conditionally built in.

• It should maintain an array of counters to keep statistics for individual PC values. After every instruction is simulated, the corresponding counter for its PC should be incremented by one. At the end of simulation, the results table should be produced. It should look like this:

  Address Count

  0x0 1000 0x2 1000 0x6 1234 ...

*It can be implemented in a generic manner to support all variants of interpreters

After the implementation is ready, it will be nice to compare performance of two builds - interpreter with stats enabled and disabled, to see the performance overhead such collection creates.

[ivanyshenko]

I'l take it

[grigory-rechistov]

Not done