Backport .insn assembler support for RISC-V architecture as needed by Rust 1.59 (!89) · Merge requests · pkg-llvm / llvm-toolchain · GitLab

See https://github.com/rust-lang/llvm-project/pull/121 and https://buildd.debian.org/status/fetch.php?pkg=rustc&arch=riscv64&ver=1.59.0%2Bdfsg1-1&stamp=1652366563&raw=0 (look for .insn)