rust/compiler/rustc_metadata
Vadim Petrochenkov 91fdbd7343 rustc_metadata: Support non-Option nullable values in metadata tables
This is a convenience feature for cases in which "no value in the table" and "default value in the table" are equivalent.
Tables using `Table<DefIndex, ()>` are migrated in this PR, some other cases can be migrated later.

This helps `DocFlags` in https://github.com/rust-lang/rust/pull/107136 in particular.
2023-01-23 19:35:03 +04:00
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