Resolve: cachify `ExternPreludeEntry.binding` through a `Cell` Provides interior mutability to the `binding` field of `ExternPreludeEntry` as this field behaves like a cache. Per [zulip thread](https://rust-lang.zulipchat.com/#narrow/channel/421156-gsoc/topic/Project.3A.20Parallel.20Macro.20Expansion/near/531390914). A little preparatory work for batched import resolution, which is part of [#gsoc > Project: Parallel Macro Expansion](https://rust-lang.zulipchat.com/#narrow/channel/421156-gsoc/topic/Project.3A.20Parallel.20Macro.20Expansion). r? `@petrochenkov` |
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