perf: optimize lcm#23482
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Which issue does this PR close?
N/A
Rationale for this change
Optimize existing function.
What changes are included in this PR?
lcm now computes its internal GCD with the binary (Stein's) algorithm (unsigned_gcd) instead of the division-based Euclidean gcd_helper, replacing per-iteration integer division with shifts for identical results.
Are these changes tested?
Existing tests.
Benchmark (criterion):
Are there any user-facing changes?