Use a dummy TypeckResults instead of Option<TypeckResults> when linting

[Jarcho]

Based on #157928

This brings the typeck results when linting back to what it was before #73743. The first four commits are from the first PR and handle eagerly fetching the typeck results and the workaround needed for rustdoc. The fifth commit adds a dummy ownerless typeck results and uses that as the initial value for the lint pass. The final commit just removes the now useless typeck_results method.

The dummy table is added to the global context more for convenience. It can't be a static since the lifetime argument is invariant. It could be created just for the linting, but that would need to add an extra lifetime parameter to LateContext and a lot of places downstream of that which would be a huge pain.

[rustbot]

clippy is developed in its own repository. If possible, consider making this change to rust-lang/rust-clippy instead.

cc @rust-lang/clippy

[rustbot]

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[rust-log-analyzer]

The job x86_64-gnu-miri failed! Check out the build log: (web) (plain enhanced) (plain)

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

   Compiling rustc_lint v0.0.0 (/checkout/compiler/rustc_lint)
error[E0599]: no method named `typeck_results` found for reference `&LateContext<'tcx>` in the current scope
   --> compiler/rustc_lint/src/noop_method_call.rs:149:41
    |
149 |             let unadjusted_expr_ty = cx.typeck_results().expr_ty(expr);
    |                                         ^^^^^^^^^^^^^^ field, not a method
    |
help: remove the arguments
    |
149 -             let unadjusted_expr_ty = cx.typeck_results().expr_ty(expr);
149 +             let unadjusted_expr_ty = cx.typeck_results.expr_ty(expr);
    |
help: there is a method `to_result` with a similar name
    |
149 -             let unadjusted_expr_ty = cx.typeck_results().expr_ty(expr);
149 +             let unadjusted_expr_ty = cx.to_result().expr_ty(expr);
    |

For more information about this error, try `rustc --explain E0599`.
[RUSTC-TIMING] rustc_lint test:false 3.257
error: could not compile `rustc_lint` (lib) due to 1 previous error

[folkertdev]

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