Make trait refs & assoc ty paths properly induce trait object lifetime defaults#129543

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fmease wants to merge 7 commits intorust-lang:mainfrom

fmease:obj-lt-def-gat

Commits on Feb 10, 2026

Make resolved GAT paths induce trait object lifetime defaults for their own args (excl. self ty)
fmease
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Split out fn `compute_object_lifetime_defaults`
fmease
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Don't needlessly search for already-found HIR generic param
fmease
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Make resolved assoc ty paths induce a trait object lifetime default for their self ty
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Tweak `#[rustc_object_lifetime_default]`
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Rename `hir::GenericArgs::{num,has}_generic_params` to `*_generic_args`
fmease
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Render trait object lifetime defaults indeterminate in lifetime-instantiated assoc ty bindings
fmease
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