www: De-list optimized debug info open project

It's unlikely that I'll have time in the summer to mentor a student
working on this project. At some point in the future I hope this project
is re-listed with a more targeted focus.
diff --git a/OpenProjects.html b/OpenProjects.html
index 567faad..61af0f0 100755
--- a/OpenProjects.html
+++ b/OpenProjects.html
@@ -164,34 +164,6 @@
 
 <!-- *********************************************************************** -->
 <div class="www_subsubsection">
-  <a name="llvm_optimized_debugging">Improve debugging of optimized code</a>
-</div>
-<!-- *********************************************************************** -->
-
-<div class="www_text">
-  <p>
-  <b>Description of the project:</b> Debugging optimized code can be
-  frustrating. Variables may appear as "&lt;value optimized out&gt;" in the
-  debugger, or may not appear at all. Line numbers in stack traces may disappear,
-  or worse, become inaccurate. To improve the situation, we have to teach more
-  LLVM optimization passes how to preserve debug info. The primary focus will be
-  on mid-level IR passes which fail to pass verification by the
-  <a href="https://reviews.llvm.org/D40512">Debugify utility</a>. This utility
-  can identify passes which drop debug info in a targeted way and can simplify
-  test case generation.
-  </p>
-  <p><b>Expected Results:</b>This project has two goals. Initially, the student
-  will gather metrics on debug info loss for individual llvm passes. This will
-  let us measure subsequent improvements. The second goal is to incrementally
-  fix as many debug info loss bugs as possible, with a focus on areas of the
-  compiler which are the hottest.</p>
-
-  <p><b>Confirmed Mentor:</b> Vedant Kumar and Davide Italiano</p>
-  <p><b>Desirable skills:</b> Intermediate knowledge of C++.</p>
-</div>
-
-<!-- *********************************************************************** -->
-<div class="www_subsubsection">
   <a name="llvm_ipo">Improve inter-procedural analyses and optimizations</a>
 </div>
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