am ba92f666: am ee3a1d5e: am 9b6687bb: Fix code snippet

<p>The “loop_until” seen in previous examples has been expanded to show the load

of B into reg0.  reg1 is assigned the numeric value 8, and reg2 is loaded from

the address [A+reg1] (same location that thread 1 is accessing).</p>

the address [A+reg1] (the same location that thread 1 is accessing).</p>

<p>This will not behave correctly because the load from B could be observed

after the load from [A+reg1].  We can fix this with a load/load barrier after

<th>Thread 2</th>

</tr>

<tr>

<td><code>A = 41<br />

<td><code>[A+8] = 41<br />

<em>store/store barrier</em><br />

B = 1    // “A is ready”</code></td>

<td><code>loop:<br />