| .. bpo: 33374 | |
| .. date: 2018-04-29-12-07-00 | |
| .. nonce: -xegL6 | |
| .. release date: 2018-04-29 | |
| .. section: Core and Builtins | |
| Tweak the definition of PyGC_Head, so compilers do not believe it is always | |
| 16-byte aligned on x86. This prevents crashes with more aggressive | |
| optimizations present in GCC 8. |