Post-dom frontier was removed in 3.0. Patch by chenwj.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160166 91177308-0d34-0410-b5e6-96231b3b80d8

Author: CunningBaldrick

docs/Passes.html

@@ -100,7 +100,6 @@ <h2><a name="intro">Introduction</a></h2>
 <tr><td><a href="#module-debuginfo">-module-debuginfo</a></td><td>Decodes module-level debug info</td></tr>
 <tr><td><a href="#no-aa">-no-aa</a></td><td>No Alias Analysis (always returns 'may' alias)</td></tr>
 <tr><td><a href="#no-profile">-no-profile</a></td><td>No Profile Information</td></tr>
-<tr><td><a href="#postdomfrontier">-postdomfrontier</a></td><td>Post-Dominance Frontier Construction</td></tr>
 <tr><td><a href="#postdomtree">-postdomtree</a></td><td>Post-Dominator Tree Construction</td></tr>
 <tr><td><a href="#print-alias-sets">-print-alias-sets</a></td><td>Alias Set Printer</td></tr>
 <tr><td><a href="#print-callgraph">-print-callgraph</a></td><td>Print a call graph</td></tr>