Add LLVM 'unreachable' instruction to list of allowed instructions.

native_client_sdk/doc_generated/reference/pnacl-bitcode-abi.html

 {{+bindTo:partials.standard_nacl_article}}
 
 <section id="pnacl-bitcode-reference-manual">
 <h1 id="pnacl-bitcode-reference-manual">PNaCl Bitcode Reference Manual</h1>
 <div class="contents local" id="contents" style="display: none">
 <ul class="small-gap">
 <li><a class="reference internal" href="#introduction" id="id1">Introduction</a></li>
 <li><p class="first"><a class="reference internal" href="#high-level-structure" id="id2">High Level Structure</a></p>
 <ul class="small-gap">
 <li><a class="reference internal" href="#data-model" id="id3">Data Model</a></li>
@@ skipping 289 matching lines @@
 </li>
 <li><p class="first"><code>bitcast</code></p>
 <p>The pointer argument of a <code>bitcast</code> instruction must be a <em>inherent</em> pointer
 (see <a class="reference internal" href="#bitcode-pointertypes"><em>pointer types</em></a>).</p>
 </li>
 <li><code>icmp</code></li>
 <li><code>fcmp</code></li>
 <li><code>phi</code></li>
 <li><code>select</code></li>
 <li><code>call</code></li>
+<li><code>unreachable</code></li>
 </ul>
 </section><section id="alloca">
 <span id="bitcode-allocainst"></span><h3 id="alloca"><span id="bitcode-allocainst"></span><code>alloca</code></h3>
 <p>The only allowed type for <code>alloca</code> instructions in PNaCl bitcode is i8. The
 size argument must be an i32. For example:</p>
 <pre>
   %buf = alloca i8, i32 8, align 4
 </pre>
 </section></section><section id="intrinsic-functions">
 <h2 id="intrinsic-functions">Intrinsic Functions</h2>
@@ skipping 126 matching lines @@
 <p>The <code>llvm.nacl.atomic.is.lock.free</code> intrinsic is designed to
 determine at translation time whether atomic operations of a certain
 <code>byte_size</code> (a compile-time constant), at a particular <code>address</code>,
 are lock-free or not. This reflects the C11 <code>atomic_is_lock_free</code>
 function from header <code>&lt;stdatomic.h&gt;</code> and the C++11 <code>is_lock_free</code>
 member function in header <code>&lt;atomic&gt;</code>. It can be used through the
 <code>__nacl_atomic_is_lock_free</code> builtin.</p>
 </section></section></section>
 
 {{/partials.standard_nacl_article}}