stack_overflow-4.py output depending on the compiler and compiler flags.

gcc -O3 (./configure):
---
test_python_call: 11904 calls before crash, stack: 704.1 bytes/call
test_python_iterator: 17460 calls before crash, stack: 480.0 bytes/call
test_python_getitem: 245760 calls before recursion error, stack: 0.2 bytes/call

=> total: 275124 calls, 1184.3 bytes per call
---

It's better than stack memory usage in 2017: https://bugs.python.org/issue30866#msg297826


clang -O3 (./configure CC=clang):
---
test_python_call: 10270 calls before crash, stack: 816.1 bytes/call
test_python_iterator: 14155 calls before crash, stack: 592.0 bytes/call
test_python_getitem: 245760 calls before recursion error, stack: 0.3 bytes/call

=> total: 270185 calls, 1408.4 bytes per call
---

clang allocates a little bit more memory on the stack than gcc.

I didn't try PGO or LTO yet.