Function shift_inst

crates/asm-to-binary/src/assembler/parser.rs:355–362

Build a shift-immediate `AsmToken` (slli, srli, srai).

(mnemonic: &str, rd: u8, rs1: u8, shamt: u8)

            } else {
                asm_warn!(out, "unrecognised bnez: {line}");
            }
        }

        // --- R-type fallback ---
        _ => {
            if let Some(tok) = parse_r_type(mnemonic, rest) {
                out.push(tok);
            } else {
                asm_warn!(out, "unrecognised instruction: {line}");
            }
        }