(copy_loop_body): Copy CALL_INSN_FUNCTION_USAGE field.

From-SVN: r7406

gcc/unroll.c

@@ -1829,6 +1829,11 @@ copy_loop_body (copy_start, copy_end, map, exit_label, last_iteration,
 	  copy = emit_call_insn (pattern);
 	  REG_NOTES (copy) = initial_reg_note_copy (REG_NOTES (insn), map);
 
+	  /* Because the USAGE information potentially contains objects other
+	     than hard registers, we need to copy it.  */
+	  CALL_INSN_FUNCTION_USAGE (copy) =
+	     copy_rtx_and_substitute (CALL_INSN_FUNCTION_USAGE (insn), map);
+
 #ifdef HAVE_cc0
 	  if (cc0_insn)
 	    try_constants (cc0_insn, map);