Sort of a grab-bag of improvements:

• Silence some unused variable warnings in the tier two interpreter.
• Replace the one remaining use ofGOTO_ERROR(error) withERROR_NO_POP().
• Fix some bad format strings used for tier two debugging output.
• Replace the handful of uses ofGOTO_UNWIND withGOTO_TIER_ONE, replaceEXIT_TO_TIER1 withGOTO_TIER_ONE, unify thegoto_to_tier1,exit_to_tier1, anderror_tier_two labels into theGOTO_TIER_ONE macro, and remove the unusedexit_to_tier1_dynamic label andEXIT_TO_TIER1_DYNAMIC macro.
• Replace separatePy_DECREF andNULLs oftstate->previous_executor withPy_CLEAR calls, sincePy_DECREF escapes.
• Move the refcounting to keep the first JIT executor alive from the shim frame into theGOTO_TIER_TWO macro.
• Add aCURRENT_TARGET macro so the same return-to-tier-one logic can be shared by the interpreter and JIT.
• Remove a bunch of unnecessary(void)item; lines from the abstract interpreter (these were ironically forcing the values to be loaded).
• Mark_PyFrame_GetBytecode as non-escaping.
• Use the samePATCH_VALUE implementation for the JIT templates and the shim frame.
• Perform the same cleanups in the JIT that were done in the interpreter.

• Issue:Tidy up tier two #129709