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`.

1 files changed, 9 insertions, 2 deletions

diff --git a/Lib/test/support/__init__.py b/Lib/test/support/__init__.py
index de7db70..f64f88d 100644
--- a/Lib/test/support/__init__.py
+++ b/Lib/test/support/__init__.py
@@ -2355,8 +2355,15 @@ def adjust_int_max_str_digits(max_digits):
 #For recursion tests, easily exceeds default recursion limit
 EXCEEDS_RECURSION_LIMIT = 5000
 
-# The default C recursion limit (from Include/cpython/pystate.h).
-Py_C_RECURSION_LIMIT = 1500
+def _get_c_recursion_limit():
+    try:
+        import _testcapi
+        return _testcapi.Py_C_RECURSION_LIMIT
+    except (ImportError, AttributeError):
+        return 1500  #  (from Include/cpython/pystate.h)
+
+# The default C recursion limit.
+Py_C_RECURSION_LIMIT = _get_c_recursion_limit()
 
 #Windows doesn't have os.uname() but it doesn't support s390x.
 skip_on_s390x = unittest.skipIf(hasattr(os, 'uname') and os.uname().machine == 's390x',