Fix UB in 128 bit cttz/ctlz intrinsics#672
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FractalFir wants to merge 1 commit intorust-lang:masterfrom 
Open
Fix UB in 128 bit cttz/ctlz intrinsics#672FractalFir wants to merge 1 commit intorust-lang:masterfrom 
FractalFir wants to merge 1 commit intorust-lang:masterfrom