[llvm-branch-commits] [llvm] [BOLT] Improve exception handling in NFC-Mode (PR #146513)

[Paschalis Mpeis via llvm-branch-commits]

paschalis-mpeis wrote:

Forced-push to rebase since the parent PR now has a `--create-wrapper` flag.

In the latest patch, `switch_back` is a function called whenever something goes wrong after checking out the prev revision, ie:
- building the old binary fails, or
- setting up the wrapper fails.

I also delete llvm-bolt at the start, since we rebuild it for the current revision anyway.

https://github.com/llvm/llvm-project/pull/146513