Add a missing include to clang unit tests

Author: rnk

clang/unittests/AST/DeclTest.cpp

@@ -14,9 +14,10 @@
 #include "clang/AST/Mangle.h"
 #include "clang/ASTMatchers/ASTMatchFinder.h"
 #include "clang/Basic/LLVM.h"
+#include "clang/Basic/TargetInfo.h"
 #include "clang/Tooling/Tooling.h"
-#include "gtest/gtest.h"
 #include "llvm/IR/DataLayout.h"
+#include "gtest/gtest.h"
 
 using namespace clang::ast_matchers;
 using namespace clang::tooling;