[cleanup] Add a missing include exposed by resorting other includes.
Should fix the build.

llvm-svn: 199081
diff --git a/llvm/tools/llvm-readobj/ARMEHABIPrinter.h b/llvm/tools/llvm-readobj/ARMEHABIPrinter.h
index 6311948..2cba126 100644
--- a/llvm/tools/llvm-readobj/ARMEHABIPrinter.h
+++ b/llvm/tools/llvm-readobj/ARMEHABIPrinter.h
@@ -10,6 +10,7 @@
 #ifndef LLVM_READOBJ_ARMEHABI_PRINTER_H
 #define LLVM_READOBJ_ARMEHABI_PRINTER_H
 
+#include "Error.h"
 #include "StreamWriter.h"
 #include "llvm/Object/ELF.h"
 #include "llvm/Object/ELFTypes.h"