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#160 copies the solution back into
b, but codegen emits identical expressions once, so inline linear SCCs with the samebshare that buffer and the second solve uses the first one's solution as its right-hand side. The solution now goes into a new array, and theLinearCacheis still reused: a 2x2 block's RHS call takes 135 ns vs 122 ns on main (151 ns on 1.20.6).