fix an off-by-one

Author: Fidget-Spinner

Lib/test/test_sys.py

@@ -2254,7 +2254,7 @@ def frame_3_jit() -> None:
                 # 1 extra iteration for tracing.
                 for i in range(_testinternalcapi.TIER2_THRESHOLD + 2):
                     # Careful, doing this in the reverse order breaks tracing:
-                    expected = {enabled} and i >= _testinternalcapi.TIER2_THRESHOLD + 1
+                    expected = {enabled} and i >= _testinternalcapi.TIER2_THRESHOLD
                     assert sys._jit.is_active() is expected
                     frame_2_jit(expected)
                     assert sys._jit.is_active() is expected

Python/bytecodes.c

@@ -5616,10 +5616,8 @@ dummy_func(
             if (full) {
                 LEAVE_TRACING();
                 int err = stop_tracing_and_jit(tstate, frame);
-                ERROR_IF(err < 0);
-                // We can't use DISPATCH() here, as it may clobber oparg,
-                // which may have been set by a previous EXTENDED_ARG.
-                DISPATCH_GOTO_NON_TRACING();
+                ERROR_IF(err < 0);.
+                DISPATCH();
             }
             // Super instructions. Instruction deopted. There's a mismatch in what the stack expects
             // in the optimizer. So we have to reflect in the trace correctly.