Michael Goulet b7e4433974 Foreign types are trivially drop
- Also rename a trivial_const_drop to match style of other functions in
  the util module.
- Also add a test for `const Drop` that doesn't depend on a `~const`
  bound.
- Also comment a bit why we remove the const bound during dropck impl
  check.
2022-01-19 20:07:04 -08:00
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