jit: remove some unused fields from recording::union_ (PR jit/81672)

gcc::jit::recording::union_ has some stray fields, which
are duplicates of those in the compound_type base class.

It looks like these have been present since the initial merger of the jit
branch to trunk (r217374), where it had three duplicate fields:

 location *m_loc;
 string *m_name;
 fields *m_fields;

I removed the duplicate field "m_fields" in r219564 but missed the other
two.

This patch removes them.

gcc/jit/ChangeLog:
	PR jit/81672
	* jit-recording.h (gcc::jit::recording::union_): Remove fields
	"m_loc" and "m_name".

From-SVN: r257066

gcc/jit/ChangeLog

+2018-01-25  David Malcolm  <dmalcolm@redhat.com>
+
+	PR jit/81672
+	* jit-recording.h (gcc::jit::recording::union_): Remove fields
+	"m_loc" and "m_name".
+
 2018-01-03  Jakub Jelinek  <jakub@redhat.com>
 
 	Update copyright years.

gcc/jit/jit-recording.h

@@ -932,10 +932,6 @@ public:
 private:
   string * make_debug_string () FINAL OVERRIDE;
   void write_reproducer (reproducer &r) FINAL OVERRIDE;
-
-private:
-  location *m_loc;
-  string *m_name;
 };
 
 /* An abstract base class for operations that visit all rvalues within an