Update Slang to 2026.8.1

[github-actions]

Auto Generated PR to update Slang to version 2026.8.1

[Copilot]

Pull request overview

Updates the Slang bindings to align with Slang 2026.8.1, adding newly introduced API surface (coverage tracing metadata + manifest serialization, additional compiler options, and new struct definitions) and syncing the vendored slang.h.

Changes:

• Added coverage tracing support (ICoverageTracingMetadata, coverage structs, and slang_writeCoverageManifestJson binding).
• Introduced/updated interop structs for specialization arguments, compiler options, and cooperative matrix/vector metadata.
• Synced CompilerOptionName and headers/slang.h to include new options (e.g., TraceCoverage*) and new interfaces/structs.

Reviewed changes

Copilot reviewed 6 out of 27 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/Structs/SpecializationArg.cs	Adds SpecializationArg and a custom marshaller for the new Slang specialization-arg ABI.
src/Structs/SourceLocation.cs	Adds SourceLocation struct + marshaller for source-location queries.
src/Structs/SlangReflectionGenericArg.cs	Adds union-like struct for generic specialization arguments in reflection APIs.
src/Structs/CoverageEntryInfo.cs	Adds coverage entry attribution struct + marshalling.
src/Structs/CoverageBufferInfo.cs	Adds coverage buffer binding info struct + marshalling.
src/Structs/CooperativeVectorTypeUsageInfo.cs	Adds cooperative vector usage info struct.
src/Structs/CooperativeVectorCombination.cs	Adds cooperative vector combination struct.
src/Structs/CooperativeMatrixType.cs	Adds cooperative matrix type struct.
src/Structs/CooperativeMatrixCombination.cs	Adds cooperative matrix combination struct.
src/Structs/CompilerOptionValue.cs	Adds CompilerOptionValue struct + marshaller to match new header shape.
src/Structs/CompilerOptionEntry.cs	Adds CompilerOptionEntry struct + marshaller (including array helpers).
src/Slang.cs	Updates blob overload docs and adds WriteCoverageManifestJson P/Invoke.
src/ICoverageTracingMetadata.cs	Adds the new COM interface for coverage tracing metadata.
src/Enums/CompilerOptionName.cs	Extends compiler option enum with new options + extra doc comments.
headers/slang.h	Updates vendored Slang header to 2026.8.1 (new options, structs, and interfaces).

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.