[analyzer] Rely on LLVM Dominators in Clang dominator computation.

(Previously, Clang used it's implementation of dominators.)

The patch is contributed by Guoping Long!

llvm-svn: 145858
diff --git a/clang/lib/StaticAnalyzer/Checkers/DebugCheckers.cpp b/clang/lib/StaticAnalyzer/Checkers/DebugCheckers.cpp
index c06be44..bd1b854 100644
--- a/clang/lib/StaticAnalyzer/Checkers/DebugCheckers.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/DebugCheckers.cpp
@@ -30,8 +30,8 @@
   void checkASTCodeBody(const Decl *D, AnalysisManager& mgr,
                         BugReporter &BR) const {
     if (AnalysisDeclContext *AC = mgr.getAnalysisDeclContext(D)) {
-      DominatorTree dom(*AC);
-      dom.BuildDominatorTree();
+      DominatorTree dom;
+      dom.buildDominatorTree(*AC);
       dom.dump();
     }
   }