llvm-project

c65d6cb0 - [SelectionDAG] Return std::optional<unsigned> from getValidShiftAmount and friends. NFC (#156224)

[SelectionDAG] Return std::optional<unsigned> from getValidShiftAmount and friends. NFC (#156224) Instead of std::optional<uint64_t>. Shift amounts must be less than or equal to our maximum supported bit widths which fit in unsigned. Most of the callers already assumed it fit in unsigned.