Rollup merge of #157116 - makai410:with-tcx-refactor, r=oli-obk

rustc_public: add `with_cx()` to `CompilerInterface`

Changes a bunch of:
```rust
let cx = self.cx.borrow();
let mut tables = self.tables.borrow_mut();
```
to:
```rust
with_cx(|tables, cx| { ... })
```
in `compiler_interface.rs`.

r? @celinval

Author: JonathanBrouwer