[llvm] [coro][pgp] Do not insert counters in the `suspend` block (PR #71262)

[Mircea Trofin via llvm-commits]

mtrofin wrote:

> Can a testcase be added in instrumentation test dir as well?

I could copy the ones I edited over, is that what you mean?

https://github.com/llvm/llvm-project/pull/71262