Auto merge of #98840 - cjgillot:span-inline-ctxt, r=wesleywiser

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Inline SyntaxContext in both encoded span representation.

The current interned representation for spans does not use the `ctxt_or_zero: u16` field.  This PR proposes to use this field to store the `SyntaxContext` of the interned span instead.  When `ctxt_or_zero` and the interned span's `ctxt` don't match, the inlined one takes precedence.

This allows to implement `Span::ctxt` and `Span::with_ctxt` with much less probability to access the interner.  Those functions are used a lot for hygiene, so this may be worth it.

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bors 2022-09-22 17:59:27 +00:00

parent df8d7ad310 d60b555933

commit d2167f5614

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