Reorder enum output_type for better code generation

Works around a gcc bug #67328 for the most commonly used of bfd_link_pic
and bfd_link_executable.

	* bfdlink.h (enum output_type): Reorder enum.

include/ChangeLog

@@ -1,3 +1,7 @@
+2015-08-23  Alan Modra  <amodra@gmail.com>
+
+	* bfdlink.h (enum output_type): Reorder enum.
+
 2015-08-19  Alan Modra  <amodra@gmail.com>
 
 	* bfdlink.h (enum output_type): Delete type_executable, add type_pde

include/bfdlink.h

@@ -264,8 +264,8 @@ struct bfd_elf_version_tree;
 enum output_type
 {
   type_pde,
-  type_relocatable,
   type_pie,
+  type_relocatable,
   type_dll,
 };