llvm-project

d6923801 - [ADT] Define countr_zero in terms of popcount (NFC) (#158519)

[ADT] Define countr_zero in terms of popcount (NFC) (#158519) We can express the fallback mechanism of llvm::countr_zero a lot more concisely with llvm::popcount. Since llvm::countr_zero now requires llvm::popcount, this patch moves llvm::popcount earlier.