This pull request partially addresses the 2 issues listed before. As part of the work required for this PR, `NonCopyable` was completely removed.
This PR also replaces the content of `type_is_pod` with `TypeContents::is_pod`, although `type_is_content` is currently not being used anywhere. I kept it for consistency with the other functions that exist in this module.
cc #10834
cc #10577
Proposed static restrictions
=====================
Taken from [this](https://github.com/mozilla/rust/pull/11979#issuecomment-
35768249) comment.
I expect some code that, at a high-level, works like this:
- For each *mutable* static item, check that the **type**:
- cannot own any value whose type has a dtor
- cannot own any values whose type is an owned pointer
- For each *immutable* static item, check that the **value**:
- does not contain any ~ or box expressions (including ~[1, 2, 3] sort of things, for now)
- does not contain a struct literal or call to an enum variant / struct constructor where
- the type of the struct/enum is freeze
- the type of the struct/enum has a dtor