Reserve the frame pointer in JIT code

Author: brandtbucher

Tools/jit/_targets.py

@@ -158,6 +158,7 @@ async def _compile(
             # code than -O3). As a nice benefit, it uses less memory too:
             "-Os",
             "-S",
+            "-Xclang", f"-mframe-pointer={'all' if opname == 'shim' else 'reserved'}",
             # Shorten full absolute file paths in the generated code (like the
             # __FILE__ macro and assert failure messages) for reproducibility:
             f"-ffile-prefix-map={CPYTHON}=.",