Index: web.c
===================================================================
--- web.c       (revision 193454)
+++ web.c       (working copy)
@@ -335,9 +335,16 @@ web_main (void)
   unsigned int uses_num = 0;
   rtx insn;

+  /* Add the flags and problems we need.  The DF_EQ_NOTES flag is set so
+     that uses of registers in REG_EQUAL and REG_EQUIV notes are included
+     in the web that their DEF belongs to, so that these uses are also
+     properly renamed.  The DF_NOTE problem is added to make sure that
+     all notes are up-to-date and valid: Re-computing the notes problem
+     also cleans up all dead REG_EQUAL notes.  */
   df_set_flags (DF_NO_HARD_REGS + DF_EQ_NOTES);
   df_set_flags (DF_RD_PRUNE_DEAD_DEFS);
   df_chain_add_problem (DF_UD_CHAIN);
+  df_note_add_problem ();
   df_analyze ();
   df_set_flags (DF_DEFER_INSN_RESCAN);