Rearange header order to match llvm style. This exposed some missing types.
Also fix some Platform.h includes that somehow got missed last time.

llvm-svn: 153590
diff --git a/lld/lib/Core/NativeReader.cpp b/lld/lib/Core/NativeReader.cpp
index 41a2823..ffd216c 100644
--- a/lld/lib/Core/NativeReader.cpp
+++ b/lld/lib/Core/NativeReader.cpp
@@ -7,9 +7,11 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include <vector>
+#include "NativeFileFormat.h"
 
-#include <assert.h>
+#include "lld/Core/Atom.h"
+#include "lld/Core/Error.h"
+#include "lld/Core/File.h"
 
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/OwningPtr.h"
@@ -17,11 +19,7 @@
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/MemoryBuffer.h"
 
-#include "lld/Core/Error.h"
-#include "lld/Core/File.h"
-#include "lld/Core/Atom.h"
-
-#include "NativeFileFormat.h"
+#include <vector>
 
 namespace lld {