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8936cda523
Pin x21 = pb + pc (the instruction pointer) as a callee-saved register that survives C++ calls. x21 is set during dispatch and remains valid throughout the entire handler. This eliminates redundant `add x9, x26, x25` instructions from every load_operand, store_operand, load_label, and dispatch_next sequence. Also optimizes `lea dst, [pb, pc]` to `mov dst, x21`. For dispatch_next, the next opcode is loaded via `ldrb w9, [x21, #size]` and x21 is updated incrementally (`add x21, x21, #size`), which also improves the dependency chain vs recomputing from x26 + x25. dispatch_current is promoted from a DSL macro to a codegen instruction so it can set x21 for the next handler.