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improve constant prop in gcd (#41258)
With this PR: ```julia julia> f(x) = x * (2//3) f (generic function with 1 method) julia> @code_typed f(2.3) CodeInfo( 1 ─ %1 = Base.mul_float(x, 0.6666666666666666)::Float64 └── return %1 ) => Float64 ``` It is a bit unfortunate to have to resort to `@pure` here, but I could not get it to constant fold any other way. I don't think this usage should be problematic since the method only accepts `BitInteger`s and only ever calls methods that really shouldn't be redefined. fixes #32024
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