<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/71064>71064</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [BOLT] X86/clang-nolbr.test fails with assertion added in #68617
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            BOLT
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
            spupyrev
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          aaupov
      </td>
    </tr>
</table>

<pre>
    https://github.com/llvm/llvm-project/commit/d0584e248d2dc9e9f425caed5983282e2749159d breaks upstream binary test `X86/clang-nolbr.test`: 
https://lab.llvm.org/buildbot/#/builders/244/builds/19433

BOLT crashes with assertion added in https://github.com/llvm/llvm-project/pull/68617:

```
llvm-bolt.old: /home/worker/bolt-worker2/bolt-x86_64-ubuntu-nfc/llvm-project/llvm/lib/Transforms/Utils/CodeLayout.cpp:767: void {anonymous}::ExtTSPImpl::mergeChainPairs(): Assertion `minDensity > 0.0 && maxDensity > 0.0 && "incorrectly computed chain densities"' failed.
```

The test uses no-LBR (IP sampling) profile.
</pre>
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