[llvm] fix for Issue #139786 - Missed Optimization: max(max(x, c1) << c2, c3) —> max(x << c2, c3) when c3 >= c1 * 2 ^ c2 (PR #140526)

[Yingwei Zheng via llvm-commits]

https://github.com/dtcxzyw edited https://github.com/llvm/llvm-project/pull/140526