Remove some unneeded headers and replace some headers with forward class declarations (NFC)

Differential Revision: http://reviews.llvm.org/D19154

Patch by Eugene Kosov <claprix@yandex.ru>

From: Mehdi Amini <mehdi.amini@apple.com>
llvm-svn: 266524

1 files changed, 2 insertions, 1 deletions

diff --git a/llvm/unittests/ADT/StringMapTest.cpp b/llvm/unittests/ADT/StringMapTest.cpp
index a85cae1..6ca701b 100644
--- a/llvm/unittests/ADT/StringMapTest.cpp
+++ b/llvm/unittests/ADT/StringMapTest.cpp
@@ -7,9 +7,10 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "gtest/gtest.h"
 #include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/Twine.h"
 #include "llvm/Support/DataTypes.h"
+#include "gtest/gtest.h"
 #include <tuple>
 using namespace llvm;