report call site of inlined scopes for large assignment lints
Addressed issue: #121672
Tracking issue: #83518
r? `@oli-obk`
I tried to follow your comment about what to do [here](https://github.com/rust-lang/rust/issues/121672#issuecomment-1972783675). However, I'm totally unfamiliar with the code so far (this is my first contribution touching compiler code), so I apologize in advance if I did something stupid 😅
In particular, I'm not sure I use the _correct_ source scope to look for inline data, as there is a whole `IndexVec` of them. My changes definitely did something, as can be seen by the added ui test. However, the result is not as anticipated in the issue:
```
LL | let cell = std::cell::UnsafeCell::new(data);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ value moved from here
```
instead of
```
LL | let cell = std::cell::UnsafeCell::new(data);
| ^^^^ value moved from here
```
raising my suspicion that maybe I got the wrong source scope.
An example directive is ignore-test. In legacy compiletest style, the header
would be written as
// ignore-test
but in ui_test style, the header would be written as
//@ ignore-test
compiletest is changed to accept only //@ directives for UI tests
(currently), and will reject and report an error if it encounters any
comments // <content> that may be parsed as a legacy compiletest-style
test header. To fix this, you should migrate to the ui_test-style header
//@ <content>.
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