Polymorphic code generation experiment

[nxsaken]

Metadata
Point of contact	@camelid
Team(s)	compiler, types
Goal document	2026/polymorphization

Summary

Implement experimental support in the Rust compiler for polymorphic code generation. Instead of monomorphizing generic code, the compiler will generate type-agnostic instances and add hidden vtable parameters where needed, which should reduce compile times and generated binary sizes.

Tasks and status

[nxsaken]

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