Support ignorable profiling context.
Support ignorable profiling context.

- Contexts starting with "MOV BX, BX" and ending with "MOV CX, CX" are
  ignored i.e., excluded from profiling. This feature is necessary to
  exclude runtime system functions from profiling.

anamud/mir-dev,anamud/mir-dev,anamud/mir-dev,anamud/mir-dev,anamud/mir-dev