[llvm] [PGO] Sampled instrumentation in PGO to speed up instrumentation binary (PR #69535)

[via llvm-commits]

xur-llvm wrote:

> Does this also work with CS-IRPGO?

Yes. This works with CS-IRPGO. There is a test for this.

https://github.com/llvm/llvm-project/pull/69535