[llvm] [profdata] Return Expected from showSampleProfile() (PR #149907)

[Mingming Liu via llvm-commits]

https://github.com/mingmingl-llvm approved this pull request.

The change itself lgtm. 

It's not very clear to me why https://github.com/llvm/llvm-project/pull/149433 caused failure in the first place and whether this change will fix it though.. 

fyi, https://github.com/google/sanitizers/wiki/SanitizerBotReproduceBuild#try-local-changes is useful to reproduce a certain (e.g., sanitizer) build bot failures with a local llvm repo and verify fixes, but the running multi-stage script can take O(hours). Based on the host info of one hwsan worker (https://lab.llvm.org/buildbot/#/workers/17), I'm guessing https://github.com/llvm/llvm-zorg/blob/main/zorg/buildbot/builders/sanitizers/buildbot_bootstrap_hwasan.sh is the script.

https://github.com/llvm/llvm-project/pull/149907