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3d5b5602b4
Convert Jump, JumpNullish, and JumpUndefined to declare named temporaries instead of pinning values to t0..t2 directly. These three handlers are macro-free and call-free, so the migration is mechanical and the allocator picks register assignments equivalent in cost to the hand-written positional code. The other Jump* handlers (JumpIf/JumpTrue/JumpFalse) drive call_helper, which still needs the value to be in t1 (rcx) on x86 by the existing register convention. Migrating those needs DSL syntax to attach call_helper's input/output to named temps; until that lands they stay on the positional form.