[llvm] [SimplifyCFG] `switch`: Do Not Transform the Default Case if the Condition is Too Wide (PR #77831)

[Qiongsi Wu via llvm-commits]

qiongsiwu wrote:

> @qiongsiwu Please do merge it now. If necessary, this change will be reverted together with the base commit.

Thanks for chiming in @nikic ! Merging this PR now. 

https://github.com/llvm/llvm-project/pull/77831