[llvm] [DFAJumpThreading] Add an early exit heuristic for unpredictable values (PR #85015)

[via llvm-commits]

XChy wrote:

> this function is just an unconditional DFS from switch(and every BB can be visited multiple times). 

Or a tight limit can be performed on restricting how many times the BBs can be visited, it sometimes result in exponential runtime.



https://github.com/llvm/llvm-project/pull/85015