gh-111520: Integrate the Tier 2 interpreter in the Tier 1 interpreter (#111428)

- There is no longer a separate Python/executor.c file.
- Conventions in Python/bytecodes.c are slightly different -- don't use `goto error`,
  you must use `GOTO_ERROR(error)` (same for others like `unused_local_error`).
- The `TIER_ONE` and `TIER_TWO` symbols are only valid in the generated (.c.h) files.
- In Lib/test/support/__init__.py, `Py_C_RECURSION_LIMIT` is imported from `_testcapi`.
- On Windows, in debug mode, stack allocation grows from 8MiB to 12MiB.
- **Beware!** This changes the env vars to enable uops and their debugging
  to `PYTHON_UOPS` and `PYTHON_LLTRACE`.

Tools/cases_generator/instructions.py

@@ -162,7 +162,7 @@ class Instruction:
                     f"{func}(&this_instr[{active.offset + 1}].cache);"
                 )
             else:
-                out.emit(f"{typ}{ceffect.name} = ({typ.strip()})operand;")
+                out.emit(f"{typ}{ceffect.name} = ({typ.strip()})next_uop[-1].operand;")
 
         # Write the body, substituting a goto for ERROR_IF() and other stuff
         assert dedent <= 0
@@ -197,6 +197,8 @@ class Instruction:
                 ninputs, symbolic = list_effect_size(ieffs)
                 if ninputs:
                     label = f"pop_{ninputs}_{label}"
+                if tier == TIER_TWO:
+                    label = label + "_tier_two"
                 if symbolic:
                     out.write_raw(
                         f"{space}if ({cond}) {{ STACK_SHRINK({symbolic}); goto {label}; }}\n"