Checker: random include cleanup.

llvm-svn: 99731
diff --git a/clang/lib/Checker/UndefBranchChecker.cpp b/clang/lib/Checker/UndefBranchChecker.cpp
index e047b18..9088345 100644
--- a/clang/lib/Checker/UndefBranchChecker.cpp
+++ b/clang/lib/Checker/UndefBranchChecker.cpp
@@ -13,6 +13,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "GRExprEngineInternalChecks.h"
+#include "clang/Checker/BugReporter/BugType.h"
 #include "clang/Checker/PathSensitive/Checker.h"
 
 using namespace clang;