gas: free sy_hash, macro_hash and po_hash

* macro.c (macro_end): New function.
	* macro.h (macro_end): Declare.
	* read.c (read_end, poend): New functions.
	* read.h (read_end): Declare.
	* symbols.c (symbol_end): New function.
	* symbols.h (symbol_end): Declare.
	* output-file.c (output_file_close): Call new *_end functions.

gas/output-file.c

@@ -20,6 +20,8 @@
 
 #include "as.h"
 #include "subsegs.h"
+#include "sb.h"
+#include "macro.h"
 #include "output-file.h"
 
 #ifndef TARGET_MACH
@@ -103,6 +105,9 @@ output_file_close (void)
   if (!keep_it && filename)
     unlink_if_ordinary (filename);
 
+  macro_end ();
+  read_end ();
+  symbol_end ();
   subsegs_end (obs);
 
   if (!res)