Function parse_csrw

crates/asm-to-binary/src/assembler/parser.rs:609–616

Parse `csr, rs` for `csrw` (pseudo: csrrw x0, csr, rs).

(operands: &str)

        "bgez" => (BranchKind::Bge, rs, 0),
        "bltz" => (BranchKind::Blt, rs, 0),
        "bgtz" => (BranchKind::Blt, 0, rs), // rs > 0  ==  0 < rs
        _ => return None,
    };
    Some(AsmToken::Branch {
        kind,
        rs1,
        rs2,
        target,
    })
}