Rollup merge of #135007 - compiler-errors:outlives-tweaks, r=oli-obk

Some type-outlives computation tweaks

Some tweaks that I wrote when investigating https://github.com/rust-lang/rust/issues/135006.

The only commit that's probably interesting here is f3646748cd9d3cf5a6834f299acd10af1fe99c1b (the first commit). For some reason it was concerned with filtering out param-env outlives clauses when they matched item-bound outlives clauses. However, if you look at the rest of the control flow for that function, not filtering out those bounds doesn't actually affect the behavior materially.

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