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

[Matthias Braun via llvm-commits]

MatzeB wrote:

Still trying to understand the details here. Is the problem here that new instructions are inserted between a `llvm.coro.suspend` call and the corresponding `switch` of the results? If so wouldn't it be easier to just move the instrumentation upwards in the basic block?

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