Auto merge of #132625 - compiler-errors:cache-only-if-opaque, r=lcnr

Only disable cache if predicate has opaques within it

This is an alternative to rust-lang/rust#132075.

This refines the check implemented in rust-lang/rust#126024 to only disable the global cache if the predicate being considered has opaques in it. This is still theoretically unsound, since goals can indirectly rely on opaques in the defining scope, but we're much less likely to hit it.

It doesn't totally fix rust-lang/rust#132064: for example, `lemmy` goes from 1:29 (on rust 1.81) to 9:53 (on nightly) to 4:07 (after this PR). But I think it's at least *more* sound than a total revert :/

r? lcnr

Author: bors