[Bug target/65803] blackfin: internal compiler error: segment fault linux kernel

[gang.chen.5i5j at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65803

--- Comment #4 from Chen Gang <gang.chen.5i5j at gmail dot com> ---
Reference to gccint.pdf Page 268 for jump_isn, we know that JUMP_LABLE() must
be defined after optimization completed. In our case, we are just doing
optimization, and is almost finished, so we need set JUMP_LABLE() after emit
jump_insn.

The related diff is bellow:

diff --git a/gcc/config/bfin/bfin.c b/gcc/config/bfin/bfin.c
index dc24ed5..0297b59 100644
--- a/gcc/config/bfin/bfin.c
+++ b/gcc/config/bfin/bfin.c
@@ -3777,7 +3777,10 @@ hwloop_optimize (hwloop_info loop)
        }
       else
        {
-         emit_jump_insn (gen_jump (label));
+         rtx_insn * ret = emit_jump_insn (gen_jump (label));
+
+         JUMP_LABEL(ret) = label;
+         LABEL_NUSES (label)++;
          seq_end = emit_barrier ();
        }
     }