Reapply r149311 which I reverted by mistake.

 Original log:

 Convert ProgramStateRef to a smart pointer for managing the reference counts of ProgramStates.  This leads to a slight memory
 improvement, and a simplification of the logic for managing ProgramState objects.
 # Please enter the commit message for your changes. Lines starting

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@149339 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/StaticAnalyzer/Core/Checker.cpp b/lib/StaticAnalyzer/Core/Checker.cpp
index f793c7fe29..07e0aac2d4 100644
--- a/lib/StaticAnalyzer/Core/Checker.cpp
+++ b/lib/StaticAnalyzer/Core/Checker.cpp
@@ -11,6 +11,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "clang/StaticAnalyzer/Core/PathSensitive/ProgramState.h"
 #include "clang/StaticAnalyzer/Core/Checker.h"
 
 using namespace clang;