Cache some data structures for debuginfo generation

[Kobzol]

Opening for a perf. test.

[Kobzol]

@bors try @rust-timer queue

[rust-timer]

Awaiting bors try build completion.

@rustbot label: +S-waiting-on-perf

[rust-bors]

⌛ Trying commit e6da08e with merge bd84d54…

To cancel the try build, run the command @bors try cancel.

Workflow: https://github.com/rust-lang/rust/actions/runs/28805376096

[rust-log-analyzer]

The job pr-check-2 failed! Check out the build log: (web) (plain enhanced) (plain)

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

249 | |                 ty::TypingEnv::fully_monomorphized(),
...   |
252 | |             &mut name,
253 | |         );
    | |_________- argument #4 of type `&mut HashSet<rustc_middle::ty::Ty<'_>, FxBuildHasher>` is missing
    |
note: function defined here
   --> compiler/rustc_codegen_ssa/src/debuginfo/type_names.rs:650:8
    |
650 | pub fn push_generic_args<'tcx>(
    |        ^^^^^^^^^^^^^^^^^
help: provide the argument
    |
246 |         type_names::push_generic_args(
...
252 |             &mut name,
253 ~             /* &mut HashSet<rustc_middle::ty::Ty<'_>, FxBuildHasher> */,
254 ~         );
    |

For more information about this error, try `rustc --explain E0061`.
[RUSTC-TIMING] rustc_codegen_cranelift test:false 1.248