gh-131798: Constant-fold _CONTAINS_OP_DICT for frozendict
#6174
| Job | Run time |
|---|---|
| 11m 28s | |
| 3m 29s | |
| 16m 47s | |
| 14m 33s | |
| 4m 40s | |
| 27m 21s | |
| 39m 50s | |
| 25m 54s | |
| 7m 4s | |
| 14m 38s | |
| 8m 56s | |
| 15m 20s | |
| 29m 35s | |
| 12m 55s | |
| 3m 44s | |
| 21m 25s | |
| 19m 52s | |
| 8m 41s | |
| 4h 46m 12s |