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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - Assertion `NumAddedValues > 1 && "Each occurrence should contribute a value"' failed."
   href="http://llvm.org/bugs/show_bug.cgi?id=16264">16264</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Assertion `NumAddedValues > 1 && "Each occurrence should contribute a value"' failed.
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>libraries
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>trunk
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>Scalar Optimizations
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>joel.gouly@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvmbugs@cs.uiuc.edu
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=10644" name="attach_10644" title="The crashing IR.">attachment 10644</a> <a href="attachment.cgi?id=10644&action=edit" title="The crashing IR.">[details]</a></span>
The crashing IR.

The attached IR fails with:
lib/Transforms/Scalar/Reassociate.cpp:1532: llvm::Value *<anonymous
namespace>::Reassociate::OptimizeAdd(llvm::Instruction *,
SmallVectorImpl<<anonymous>::ValueEntry> &): Assertion `NumAddedValues > 1 &&
"Each occurrence should contribute a value"' failed.

I've tried to create a minimal IR test case, that you can just run with:
opt -reassociate reassoc-crash.ll</pre>
        </div>
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