gh-131798: Constant-fold _CONTAINS_OP_DICT for frozendict
#6178
| Job | Run time |
|---|---|
| 14m 2s | |
| 12m 39s | |
| 3m 45s | |
| 3m 43s | |
| 31m 54s | |
| 36m 7s | |
| 9m 13s | |
| 4m 46s | |
| 29m 57s | |
| 16m 46s | |
| 7m 18s | |
| 12m 32s | |
| 14m 27s | |
| 29m 13s | |
| 23m 3s | |
| 28m 43s | |
| 8m 57s | |
| 14m 50s | |
| 5h 1m 55s |