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f0db84b1ae
Convert the global variable IC and the array-length fast path to named temps. These three handlers are large -- GetGlobal and SetGlobal carry ~20 named values across each path (realm pointer, global object, declarative environment, cache pointer, two serial numbers, the shape, the cached shape, the dictionary generations, the property offset, the named-properties pointer, the loaded value and tag, plus environment-binding state) -- and the migration makes those values easy to read instead of having to remember which slot each piece of state was occupying. GetLength's "magical" int-to-double widening picks up a named temp for the sign-bit check and the result, which removes another "NB: load_operand clobbers t0" comment.