Use .into_diagnostic() less.

This commit replaces this pattern:
```
err.into_diagnostic(dcx)
```
with this pattern:
```
dcx.create_err(err)
```
in a lot of places.

It's a little shorter, makes the error level explicit, avoids some
`IntoDiagnostic` imports, and is a necessary prerequisite for the next
commit which will add a `level` arg to `into_diagnostic`.

This requires adding `track_caller` on `create_err` to avoid mucking up
the output of `tests/ui/track-diagnostics/track4.rs`. It probably should
have been there already.

compiler/rustc_parse/src/parser/path.rs

@@ -9,7 +9,7 @@ use rustc_ast::{
     AssocConstraintKind, BlockCheckMode, GenericArg, GenericArgs, Generics, ParenthesizedArgs,
     Path, PathSegment, QSelf,
 };
-use rustc_errors::{Applicability, IntoDiagnostic, PResult};
+use rustc_errors::{Applicability, PResult};
 use rustc_span::symbol::{kw, sym, Ident};
 use rustc_span::{BytePos, Span};
 use std::mem;
@@ -318,15 +318,14 @@ impl<'a> Parser<'a> {
                             })
                         {
                             err.cancel();
-                            err = PathSingleColon {
+                            err = self.dcx().create_err(PathSingleColon {
                                 span: self.token.span,
                                 type_ascription: self
                                     .sess
                                     .unstable_features
                                     .is_nightly_build()
                                     .then_some(()),
-                            }
-                            .into_diagnostic(self.dcx());
+                            });
                         }
                         // Attempt to find places where a missing `>` might belong.
                         else if let Some(arg) = args