Rollup merge of rust-lang#103415 - compiler-errors:tiny-perf-increase…

…-on-diagnostic, r=TaKO8Ki

filter candidates in pick probe for diagnostics

Fixes rust-lang#103411, though also fine with closing this PR if my opinion (rust-lang#103411 (comment)) is shared that this doesn't need to  be fixed.

```
~/rust3$ time rustc +nightly ~/test.rs 2>/dev/null

real    0m4.853s
user    0m4.837s
sys     0m0.016s

~/rust3$ time rustc +rust3 ~/test.rs 2>/dev/null

real    0m0.193s
user    0m0.169s
sys     0m0.024s
```

Also fixes rust-lang#103427.