[Bug rtl-optimization/63348] regression gcc.dg/pr43670.c fail on MIPS

[pangbw at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63348

--- Comment #1 from baoshan <pangbw at gmail dot com> ---
I believe this regression is introduced by the code for cleanup_barriers() in
jump.c of patch https://gcc.gnu.org/ml/gcc-patches/2014-06/msg02164.html:

The call insn was followed by a barrier insn, the try_split() would emit
another barrier insn after call insn for this case( I don't know why, please
let me know the reason); after applying that patch and with option "-g" there
would be a note instruction between the call and barrier insns which result no
barrier insn is emitted by try_split().