Auto merge of #103217 - mejrs:track, r=eholk

Track where diagnostics were created.

This implements the `-Ztrack-diagnostics` flag, which uses `#[track_caller]` to track where diagnostics are created. It is meant as a debugging tool much like `-Ztreat-err-as-bug`.

For example, the following code...

```rust
struct A;
struct B;

fn main(){
    let _: A = B;
}
```
...now emits the following error message:

```
error[E0308]: mismatched types
 --> src\main.rs:5:16
  |
5 |     let _: A = B;
  |            -   ^ expected struct `A`, found struct `B`
  |            |
  |            expected due to this
-Ztrack-diagnostics: created at compiler\rustc_infer\src\infer\error_reporting\mod.rs:2275:31
```

1 files changed, 5 insertions, 0 deletions

diff --git a/compiler/rustc_passes/src/errors.rs b/compiler/rustc_passes/src/errors.rs
index 4a5cfd2d429..51ae7b9c043 100644
--- a/compiler/rustc_passes/src/errors.rs
+++ b/compiler/rustc_passes/src/errors.rs
@@ -736,6 +736,7 @@ pub struct InvalidAttrAtCrateLevel {
 }
 
 impl IntoDiagnostic<'_> for InvalidAttrAtCrateLevel {
+    #[track_caller]
     fn into_diagnostic(
         self,
         handler: &'_ rustc_errors::Handler,
@@ -868,6 +869,7 @@ pub struct BreakNonLoop<'a> {
 }
 
 impl<'a> IntoDiagnostic<'_> for BreakNonLoop<'a> {
+    #[track_caller]
     fn into_diagnostic(
         self,
         handler: &rustc_errors::Handler,
@@ -1005,6 +1007,7 @@ pub struct NakedFunctionsAsmBlock {
 }
 
 impl IntoDiagnostic<'_> for NakedFunctionsAsmBlock {
+    #[track_caller]
     fn into_diagnostic(
         self,
         handler: &rustc_errors::Handler,
@@ -1128,6 +1131,7 @@ pub struct NoMainErr {
 }
 
 impl<'a> IntoDiagnostic<'a> for NoMainErr {
+    #[track_caller]
     fn into_diagnostic(
         self,
         handler: &'a rustc_errors::Handler,
@@ -1188,6 +1192,7 @@ pub struct DuplicateLangItem {
 }
 
 impl IntoDiagnostic<'_> for DuplicateLangItem {
+    #[track_caller]
     fn into_diagnostic(
         self,
         handler: &rustc_errors::Handler,