Rollup of 7 pull requests

[JohnTitor]

Successful merges:

• Move SharedContext to context.rs #82963 (Move SharedContext to context.rs)
• Break when there is a mismatch in the type count #83535 (Break when there is a mismatch in the type count)
• rustdoc: Don't load all extern crates unconditionally #83738 (rustdoc: Don't load all extern crates unconditionally)
• Fix comment typo in once.rs #83740 (Fix comment typo in once.rs)
• Add my new email address to .mailmap #83745 (Add my new email address to .mailmap)
• Add test to ensure search tabs behaviour #83754 (Add test to ensure search tabs behaviour)
• Fix stack overflow detection on FreeBSD 11.1+ #83771 (Fix stack overflow detection on FreeBSD 11.1+)

Failed merges:

r? @ghost
@rustbot modify labels: rollup

Create a similar rollup

[JohnTitor]

@bors r+ p=7 rollup=never

[bors]

📌 Commit 9b8583a has been approved by JohnTitor

[rust-log-analyzer]

The job mingw-check failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

    Checking rustdoc v0.0.0 (/checkout/src/librustdoc)
error[E0412]: cannot find type `TyCtxt` in this scope
   --> src/librustdoc/html/render/mod.rs:865:10
    |
865 |     tcx: TyCtxt<'_>,
    |
help: consider importing one of these items
    |
35  | use crate::TyCtxt;
35  | use crate::TyCtxt;
    |
35  | use rustc_middle::ty::TyCtxt;
    |

error[E0412]: cannot find type `TyCtxt` in this scope
    --> src/librustdoc/html/render/mod.rs:1272:61
     |
1272 | fn spotlight_decl(decl: &clean::FnDecl, cache: &Cache, tcx: TyCtxt<'_>) -> String {
     |
help: consider importing one of these items
     |
35   | use crate::TyCtxt;
35   | use crate::TyCtxt;
     |
35   | use rustc_middle::ty::TyCtxt;
     |

error[E0412]: cannot find type `TyCtxt` in this scope
    --> src/librustdoc/html/render/mod.rs:2052:10
     |
2052 |     tcx: TyCtxt<'_>,
     |
help: consider importing one of these items
     |
35   | use crate::TyCtxt;
35   | use crate::TyCtxt;
     |
35   | use rustc_middle::ty::TyCtxt;
     |

error[E0412]: cannot find type `TyCtxt` in this scope
    --> src/librustdoc/html/render/mod.rs:2064:10
     |
2064 |     tcx: TyCtxt<'_>,
     |
help: consider importing one of these items
     |
35   | use crate::TyCtxt;

[JohnTitor]

@bors r-