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

[Qiongsi Wu via llvm-commits]

qiongsiwu wrote:

Thanks @DianQK !

In light of https://github.com/llvm/llvm-project/pull/76669#issuecomment-1888236912, I will not merge this PR at the moment, since https://github.com/llvm/llvm-project/pull/76669 may get reverted or require more work. 

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