[IRA]: Fixing conflict calculation from region landing pads.

The following patch fixes conflict calculation from exception landing
pads.  The previous patch processed only one newly created landing pad.
Besides it was wrong, it also resulted in large memory consumption by IRA.

gcc/ChangeLog:

	PR rtl-optimization/110215
	* ira-lives.cc: (add_conflict_from_region_landing_pads): New
	function.
	(process_bb_node_lives): Use it.

Author: vnmakarov

gcc/ira-lives.cc

@@ -1214,6 +1214,32 @@ process_out_of_region_eh_regs (basic_block bb)
 
 #endif
 
+/* Add conflicts for object OBJ from REGION landing pads using CALLEE_ABI.  */
+static void
+add_conflict_from_region_landing_pads (eh_region region, ira_object_t obj,
+				       function_abi callee_abi)
+{
+  ira_allocno_t a = OBJECT_ALLOCNO (obj);
+  rtx_code_label *landing_label;
+  basic_block landing_bb;
+
+  for (eh_landing_pad lp = region->landing_pads; lp ; lp = lp->next_lp)
+    {
+      if ((landing_label = lp->landing_pad) != NULL
+	  && (landing_bb = BLOCK_FOR_INSN (landing_label)) != NULL
+	  && (region->type != ERT_CLEANUP
+	      || bitmap_bit_p (df_get_live_in (landing_bb),
+			       ALLOCNO_REGNO (a))))
+	{
+	  HARD_REG_SET new_conflict_regs
+	    = callee_abi.mode_clobbers (ALLOCNO_MODE (a));
+	  OBJECT_CONFLICT_HARD_REGS (obj) |= new_conflict_regs;
+	  OBJECT_TOTAL_CONFLICT_HARD_REGS (obj) |= new_conflict_regs;
+	  return;
+	}
+    }
+}
+
 /* Process insns of the basic block given by its LOOP_TREE_NODE to
    update allocno live ranges, allocno hard register conflicts,
    intersected calls, and register pressure info for allocnos for the
@@ -1385,23 +1411,9 @@ process_bb_node_lives (ira_loop_tree_node_t loop_tree_node)
 		      SET_HARD_REG_SET (OBJECT_TOTAL_CONFLICT_HARD_REGS (obj));
 		    }
 		  eh_region r;
-		  eh_landing_pad lp;
-		  rtx_code_label *landing_label;
-		  basic_block landing_bb;
 		  if (can_throw_internal (insn)
-		      && (r = get_eh_region_from_rtx (insn)) != NULL
-		      && (lp = gen_eh_landing_pad (r)) != NULL
-		      && (landing_label = lp->landing_pad) != NULL
-		      && (landing_bb = BLOCK_FOR_INSN (landing_label)) != NULL
-		      && (r->type != ERT_CLEANUP
-			  || bitmap_bit_p (df_get_live_in (landing_bb),
-					   ALLOCNO_REGNO (a))))
-		    {
-		      HARD_REG_SET new_conflict_regs
-			= callee_abi.mode_clobbers (ALLOCNO_MODE (a));
-		      OBJECT_CONFLICT_HARD_REGS (obj) |= new_conflict_regs;
-		      OBJECT_TOTAL_CONFLICT_HARD_REGS (obj) |= new_conflict_regs;
-		    }
+		      && (r = get_eh_region_from_rtx (insn)) != NULL)
+		    add_conflict_from_region_landing_pads (r, obj, callee_abi);
 		  if (sparseset_bit_p (allocnos_processed, num))
 		    continue;
 		  sparseset_set_bit (allocnos_processed, num);