Auto merge of #126439 - matthiaskrgr:rollup-856xt18, r=matthiaskrgr

Rollup of 10 pull requests

Successful merges:

 - #123726 (Clarify `Command::new` behavior for programs with arguments)
 - #126088 ([1/2] clean-up / general improvements)
 - #126238 (Fix Miri sysroot for `x run`)
 - #126315 (Add pub struct with allow(dead_code) into worklist)
 - #126360 (Uplift `structural_traits.rs` into the new trait solver)
 - #126371 (Tweak output of import suggestions)
 - #126388 (const-eval: make lint scope computation consistent)
 - #126390 (Fix wording in {checked_}next_power_of_two)
 - #126392 (Small style improvement in `gvn.rs`)
 - #126402 (Fix wrong `assert_unsafe_precondition` message for `core::ptr::copy`)

r? `@ghost`
`@rustbot` modify labels: rollup

tests/ui/crashes/ice-6252.stderr

@@ -4,9 +4,7 @@ error[E0412]: cannot find type `PhantomData` in this scope
 LL |     _n: PhantomData,
    |         ^^^^^^^^^^^ not found in this scope
    |
-help: consider importing one of these items
-   |
-LL + use core::marker::PhantomData;
+help: consider importing this struct
    |
 LL + use std::marker::PhantomData;
    |