[llvm] [SimplifyCFG] Increase budget for FoldTwoEntryPHINode() if the branch is unpredictable. (PR #98495)

[via llvm-commits]

DianQK wrote:

> I'm wondering if it's possible to remove the `FoldTwoEntryPHINode` altogether and hand it in EarlyIfConversion.

I believe this is the right approach. The SimplifyCFG should only perform some trivial transforms from if to select in this context. 

@nikic @dtcxzyw @arsenm might provide additional ideas.

https://github.com/llvm/llvm-project/pull/98495