Do not encode gensymed imports in metadata #59296
Merged
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(Unless they are underscore
_
imports which are re-gensymed on crate loading, see #56392.)We cannot encode gensymed imports properly in metadata and if we encode them improperly, we can get erroneous name conflicts downstream.
Gensymed imports are produced by the compiler, so we control their set, and can be sure that none of them needs being encoded for use from other crates.
A workaround that fixes #59243.