checker, cgen: fix comptime T.methods with generic types and interface checking with is operator
#7631
| Job | Run time |
|---|---|
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| 2h 41m 15s | |
| 3m 56s | |
| 1h 35m 12s | |
| 1h 0m 14s | |
| 3h 19m 37s | |
| 10h 47m 42s |