[ThirdParty] Vendor LLVM RISC-V MIR tests

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+# LLVM RISC-V MIR Test Assets
+
+This directory contains unmodified LLVM test assets used to verify RCC MachineIR compatibility.
+
+- Upstream project: https://github.com/llvm/llvm-project
+- Upstream revision: `2b40c303e79f64c5c7642032554eda026594d604`
+- Upstream path: `llvm/test/CodeGen/RISCV`
+- Vendored files: all 462 `.mir` files below `llvm/test/CodeGen/RISCV`
+- License: Apache License v2.0 with LLVM Exceptions; see `LICENSE.TXT`
+- Sorted path-list SHA-256: `5b4dce23ecdca0b1c66eb98e4fa1c9ab41d86ec72a04770f56a451364ead3b5f`
+- Aggregate content SHA-256: `6fffb35c378e290a030e4dff07d5a3dbb3d0e16f81012925891872cb051299c9`
+
+The aggregate content digest is the SHA-256 of the sorted, relative-path `sha256sum` output for
+all vendored `.mir` files. Test inputs, `RUN:` directives, and FileCheck assertions must remain
+unchanged. RCC-specific classifications and acceptance results live under
+`docs/compiler-architecture/` rather than in these upstream files.