llvm dev - Apr 2017 - How to compute the number of times each instruction, basic block, or region called at run time?

I used llvm-cov to compute how many times each high level instruction is
called at runtime.
I need to insert a code at mcjit to do the similar job. I searched at
instrumentation pass.
Is there a function returns bool that indicates current instruction is
called or not ?and how many times is it  called?

Thanks,
Rasha
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