re PR rtl-optimization/80474 (ipa-cp wrongly adding LO(symbol) twice)

	PR rtl-optimization/80474
	* reorg.c (update_block): Do not ignore instructions in a delay slot.

From-SVN: r249219

gcc/ChangeLog

+2017-06-15  Eric Botcazou  <ebotcazou@adacore.com>
+
+	PR rtl-optimization/80474
+	* reorg.c (update_block): Do not ignore instructions in a delay slot.
+
 2017-06-15  Segher Boessenkool  <segher@kernel.crashing.org>
 
 	* config/rs6000/rs6000.md (add<mode>3): Use reg_or_subregno instead

gcc/reorg.c

@@ -1694,9 +1694,8 @@ own_thread_p (rtx thread, rtx label, int allow_fallthrough)
 }
 
 /* Called when INSN is being moved from a location near the target of a jump.
-   We leave a marker of the form (use (INSN)) immediately in front
-   of WHERE for mark_target_live_regs.  These markers will be deleted when
-   reorg finishes.
+   We leave a marker of the form (use (INSN)) immediately in front of WHERE
+   for mark_target_live_regs.  These markers will be deleted at the end.
 
    We used to try to update the live status of registers if WHERE is at
    the start of a basic block, but that can't work since we may remove a
@@ -1705,16 +1704,10 @@ own_thread_p (rtx thread, rtx label, int allow_fallthrough)
 static void
 update_block (rtx_insn *insn, rtx_insn *where)
 {
-  /* Ignore if this was in a delay slot and it came from the target of
-     a branch.  */
-  if (INSN_FROM_TARGET_P (insn))
-    return;
-
   emit_insn_before (gen_rtx_USE (VOIDmode, insn), where);
 
   /* INSN might be making a value live in a block where it didn't use to
      be.  So recompute liveness information for this block.  */
-
   incr_ticks_for_insn (insn);
 }