Fix compilation.

unittests/ADT/TwineTest.cpp:106:38: error: field 'Count' will be initialized after base 'llvm::FormatAdapter<int>' [-Werror,-Wreorder]
    explicit formatter(int &Count) : Count(Count), FormatAdapter(0) {}

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@290029 91177308-0d34-0410-b5e6-96231b3b80d8

unittests/ADT/TwineTest.cpp

@@ -103,7 +103,7 @@ TEST(TwineTest, toNullTerminatedStringRef) {
 
 TEST(TwineTest, LazyEvaluation) {
   struct formatter : FormatAdapter<int> {
-    explicit formatter(int &Count) : Count(Count), FormatAdapter(0) {}
+    explicit formatter(int &Count) : FormatAdapter(0), Count(Count) {}
     int &Count;
 
     void format(raw_ostream &OS, StringRef Style) { ++Count; }