[llvm] Remove prof branch weights if switch has 0-1 cases or no branch-weights set in SwitchInstProfUpdateWrapper (PR #163120)

[Manish Kausik H via llvm-commits]

Nirhar wrote:

ping @mtrofin! It would be great if you have a look, as this is an area that you touched recently.

https://github.com/llvm/llvm-project/pull/163120