emitDbgStmt

fn emitDbgStmt(gz: *GenZir, lc: LineColumn) !void {
    if (gz.is_comptime) return;
    if (gz.instructions.items.len > gz.instructions_top) {
        const astgen = gz.astgen;
        const last = gz.instructions.items[gz.instructions.items.len - 1];
        if (astgen.instructions.items(.tag)[@backingInt(last)] == .dbg_stmt) {
            astgen.instructions.items(.data)[@backingInt(last)].dbg_stmt = .{
                .line = lc[0],
                .column = lc[1],
            };
            return;
        }
    }

    _ = try gz.add(.{ .tag = .dbg_stmt, .data = .{
        .dbg_stmt = .{
            .line = lc[0],
            .column = lc[1],
        },
    } });
}