gh-139109: Dynamic opcode targets #139111
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There is no taking up of an additional register on the computed goto build in
_PyEval_EvalFrameDefaultas the instruction dispatch table is already kept in a register on x86_64.There is no regression in performance on both linux x86_64 and macOS AArch64 for tailcalling builds https://github.com/facebookexperimental/free-threading-benchmarking/tree/main/results/bm-20250917-3.15.0a0-178b03e-CLANG