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Introduce TypeInstId (#5288)

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TypeInstId is an InstId whose constant value has a type of TypeType.
This includes:
- Type value instructions, the `ClassType` or `IntLiteralType`
instructions.
- Constraint value instructions, which are the `FacetType` and
`TypeType` instructions, each of which also have type TypeType.

TypeInstId encodes in the type system that it is safe to convert the
instruction's value to a TypeId, and CHECKs at construction that this
invariant is maintained.

---------

Co-authored-by: Richard Smith <richard@metafoo.co.uk>
This commit is contained in:
Dana Jansens
2025-04-10 22:59:02 +00:00
committed by GitHub
co-authored by Richard Smith
parent 03a31bd0de
commit cf57c85545
27 changed files with 202 additions and 111 deletions
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toolchain/check/node_stack.h
+1 -1
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@@ -384,7 +384,7 @@ class NodeStack {
Parse::NodeCategory::MemberName | Parse::NodeCategory::NonExprName,
Id::KindFor<SemIR::NameId>());
set_id_if_category_is(Parse::NodeCategory::ImplAs,
Id::KindFor<SemIR::InstId>());
Id::KindFor<SemIR::TypeInstId>());
set_id_if_category_is(Parse::NodeCategory::Decl |
Parse::NodeCategory::Statement |
Parse::NodeCategory::Modifier,