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* [CodeGen] Add core machine type primitivesRichard-Qin-X2026-08-014-0/+546
| | | | | | Introduce an independent 64-bit extended LLT representation that preserves exact floating-point semantics and supports fixed and scalable vectors. Add opaque physical and virtual registers, strongly typed monotonic stable IDs, and atomic MachineFunctionProperties transitions. Export the primitives through RCCBackend::CodeGen, cover their boundary and failure cases, record the frozen invariants, and normalize the architecture document permissions.
* [Backend] Establish standalone build infrastructureRichard-Qin-X2026-08-011-0/+49
Add the thin monorepo CMake entry point and an independently configurable backend project. Enforce the Clang/C++23 toolchain, expose Make/Ninja-neutral tests and developer checks, export an installable RCCBackend package, and introduce the first Support error abstraction.