[llvm] [PredicateInfo] Support `PredicateInfo` by adding `PHI` nodes that pick up info from created branch predicates (PR #151132)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

@Rajveer100 As I said before, I am not an expert in this component so I cannot offer more insights about the implementation. From my perspective, the improvement is too small compared to the +0.1% additional compile-time cost.

https://github.com/llvm/llvm-project/pull/151132