Dylan DPC 70918ecf06
Rollup merge of #109280 - compiler-errors:no-vec-map, r=Mark-Simulacrum
Remove `VecMap`

Not sure what the use of this data structure is over just using `FxIndexMap` or a `Vec`.

r? ```@ghost```
2023-03-23 00:00:32 +05:30
..
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