winch(x64): Avoid undefined behavior on ctz/clz#13829
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Fixes bytecodealliance#13746 Optimizes the fallback sequence emitted in clz/ctz for the x64 backend, emitting a conditional move to ensure that the destination register is always defined when the source register is zero.
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Fixes #13746
Optimizes the fallback sequence emitted in clz/ctz for the x64 backend, emitting a conditional move to ensure that the destination register is always defined when the source register is zero.