[drlvm][em] Value-profiling implementation is avaible.

[Yuri Kashnikoff]

Hi!
I'am working on value-profiling implementation. Implementation in EM
is alredy avaible. Now I'am trying to implement and use it in JIT. I
can answer any questions about current implementation. I have used the
straigth algorithm (cacthing FIRST N values) as default and as
advanced algorithm the Top-N-Value algorithm from the B. Calder, P.
Feller "Value Profiling and Optimisation". I'll appreciate any
questions. Please review and comment.