Remove '#include <sstream>' from libAnalysis.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@74245 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/PathDiagnostic.cpp b/lib/Analysis/PathDiagnostic.cpp
index ec96329..a608ce0 100644
--- a/lib/Analysis/PathDiagnostic.cpp
+++ b/lib/Analysis/PathDiagnostic.cpp
@@ -18,7 +18,7 @@
 #include "clang/AST/StmtCXX.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/Support/Casting.h"
-#include <sstream>
+
 using namespace clang;
 using llvm::dyn_cast;
 using llvm::isa;