[Bug rtl-optimization/19705] -fno-branch-count-reg doesn't prevent decrement and branch instructions on a count register

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=19705

--- Comment #6 from Martin Sebor <msebor at gcc dot gnu.org> ---
Documentation patch posted for review:
  https://gcc.gnu.org/ml/gcc-patches/2016-02/msg00809.html