Runtime support for Swift Interop in .NET 10

[kotlarmilos]

Overview

This issue is a follow-up to #93631 and tracks the progress of runtime support required for Swift interop in .NET 10. The exact scope of work is defined by the use cases.

The list of tasks will be updated as we identify new runtime support requirements.

Tasks:

• [API Proposal]: New attribute for interop-specific struct concerns #100896
• Swift lowering support
  • [swift interop] Cannot call instance methods with at least one parameter when using SwiftSelf<T>  #107946
  • [Swift Interop] Lowering fixed buffers #107620
  • Add cache that maps structs to computed lowering to eliminate repeated runs of lowering algorithm
• SwiftSelf<T> support
  • Investigate why ARGLOADA should require a pointer-like type
  • Lower inner type instead of generic
  • Switch SwiftSelf<T> position requirement to last #108547 - CoreCLR
  • Swift interop: TestSelfIsFrozenNonEnregisteredStructWithExtraArgs fails on Mono #108855

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