c6x: Fix for RTL checking

	* config/c6x/c6x.c (predicate_insn): Do not incorrectly share RTL.

From-SVN: r245721

gcc/ChangeLog

 2017-02-24  Segher Boessenkool  <segher@kernel.crashing.org>
 
+	* config/c6x/c6x.c (predicate_insn): Do not incorrectly share RTL.
+
+2017-02-24  Segher Boessenkool  <segher@kernel.crashing.org>
+
 	* config/arc/arc.c (arc_ccfsm_advance): Only take the PATTERN of
 	this_insn if it is an INSN or JUMP_INSN.
 	(force_offsettable): Look at base, not at addr.

gcc/config/c6x/c6x.c

@@ -3799,6 +3799,7 @@ predicate_insn (rtx_insn *insn, rtx cond, bool doit)
     {
       if (doit)
 	{
+	  cond = copy_rtx (cond);
 	  rtx newpat = gen_rtx_COND_EXEC (VOIDmode, cond, PATTERN (insn));
 	  PATTERN (insn) = newpat;
 	  INSN_CODE (insn) = -1;