<p>Tarantool version:<br>
master</p>
<p>OS version:<br>
Linux</p>
<p>Bug description:</p>
<pre><code>LTO build failed because of warnings on the uninitialized
    variables treated as errors:
    
    /mnt/src/box/tuple_update.c: In function ‘do_op_splice’:
    /mnt/src/box/tuple_update.c:764:15: error: ‘str_len’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
       arg->offset = str_len;
                   ^
    /mnt/src/box/tuple_update.c:755:10: note: ‘str_len’ was declared here
      int32_t str_len;
              ^
    /mnt/src/box/tuple_update.c: In function ‘do_op_bit’:
    /mnt/src/box/tuple_update.c:725:12: error: ‘val’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
       arg->val &= val;
                ^
    /mnt/src/box/tuple_update.c:720:11: note: ‘val’ was declared here
      uint64_t val;
               ^
    /mnt/src/box/tuple_update.c: In function ‘update_read_ops’:
    /mnt/src/box/tuple_update.c:1068:4: error: ‘field_no’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
        diag_set(ClientError, ER_NO_SUCH_FIELD_NO, field_no);
        ^
    /mnt/src/box/tuple_update.c:1057:10: note: ‘field_no’ was declared here
      int32_t field_no;
              ^
    lto1: all warnings being treated as errors
</code></pre>
<p>Steps to reproduce:<br>
cmake . -DCMAKE_BUILD_TYPE=RelWithDebInfo -DENABLE_WERROR=ON -DENABLE_LTO=ON && make -j</p>
<p>Optional (but very desirable):</p>
<ul>
<li>coredump</li>
<li>backtrace</li>
<li>netstat</li>
</ul>

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