Fixes GCC PR36350

--- a/gcc/regrename.c
+++ b/gcc/regrename.c
@@ -783,6 +783,10 @@ build_def_use (basic_block bb)
 		recog_data.operand_type[i] = OP_INOUT;
 	    }
 
+	  /* Unshare dup_loc RTL */
+	  for (i = 0; i < recog_data.n_dups; i++)
+	    *recog_data.dup_loc[i] = copy_rtx(*recog_data.dup_loc[i]);
+
 	  /* Step 1: Close chains for which we have overlapping reads.  */
 	  for (i = 0; i < n_ops; i++)
 	    scan_rtx (insn, recog_data.operand_loc[i],
@@ -813,7 +817,7 @@ build_def_use (basic_block bb)
 		    OP_IN, 0);
 
 	  for (i = 0; i < recog_data.n_dups; i++)
-	    *recog_data.dup_loc[i] = copy_rtx (old_dups[i]);
+	    *recog_data.dup_loc[i] = old_dups[i];
 	  for (i = 0; i < n_ops; i++)
 	    *recog_data.operand_loc[i] = old_operands[i];
 	  if (recog_data.n_dups)