[llvm] [BOLT][test] Add pseudo-probe-split-func.test (PR #139305)

[Maksim Panchenko via llvm-commits]

https://github.com/maksfb commented:

Why is the test under x86?

There are several implicit assumptions about the compiled code in the test, such as the function being inlined and not optimized away.

https://github.com/llvm/llvm-project/pull/139305