Kazu Hirata b3af04f880 [llvm] Use llvm::countr_zero instead of findFirstSet (NFC) ...

At each call to findFirstSet in this patch, the argument is known to
be nonzero, so we can safely switch to llvm::countr_zero, which will
become std::countr_zero once C++20 is available.

2023-01-23 23:07:41 -08:00

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