[llvm] [DAG] Fold logic of zero-checks to multiplication for MinSize (PR #171805)

[Yingwei Zheng via llvm-commits]

https://github.com/dtcxzyw commented:

Do we have a TLI hook querying whether the target supports predicated instructions?
This optimization looks less profitable on ARM64 since it has conditional compares.

https://github.com/llvm/llvm-project/pull/171805