Commits on Sep 26, 2020

1. Encode less metadata for proc-macro crates …

   Currently, we serialize the same crate metadata for proc-macro crates as
   we do for normal crates. This is quite wasteful - almost none of this
   metadata is ever used, and much of it can't even be deserialized (if it
   contains a foreign `CrateNum`).
   
   This PR changes metadata encoding to skip encoding the majority of crate
   metadata for proc-macro crates. Most of the `Lazy<[T]>` fields are left
   completetly empty, while the non-lazy fields are left as-is.
   
   Additionally, proc-macros now have a def span that does not include
   their body. This was done for normal functions in rust-lang#75465, but was missed
   for proc-macros.
   
   As a result of this PR, we should only ever encode local `CrateNum`s
   when encoding proc-macro crates. I've added a specialized serialization
   impl for `CrateNum` to assert this.

   

   Aaron1011 committed Sep 26, 2020
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