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89ee41cc4c
Simplify intra-crate qualifiers.
The following is a weird pattern for a file within `rustc_middle`:
```
use rustc_middle::aaa;
use crate::bbb;
```
More sensible and standard would be this:
```
use crate::{aaa, bbb};
```
I.e. we generally prefer using `crate::` to using a crate's own name. (Exceptions are things like in macros where `crate::` doesn't work because the macro is used in multiple crates.)
This commit fixes a bunch of these weird qualifiers.
r? `@jieyouxu`
For more information about how rustc works, see the rustc dev guide.