Split overlapping_{inherent,trait}_impls

[camsteffen]

This yielded some perf improvement for me. Reduces calls to impl_trait_header query.

[rustbot]

r? @SparrowLii

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[camsteffen]

@bors2 try @rust-timer queue

[rust-timer]

Insufficient permissions to issue commands to rust-timer.

[rust-bors]

@camsteffen: 🔑 Insufficient privileges: not in try users

[chenyukang]

@bors try @rust-timer queue

[rust-timer]

Awaiting bors try build completion.

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

[rust-bors]

⌛ Trying commit 735ddcc with merge 9074fa7…

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

Workflow: https://github.com/rust-lang/rust/actions/runs/18364322555