[Bug rtl-optimization/64081] [5/6/7 Regression] r217827 prevents RTL loop unroll

[dje at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64081

--- Comment #43 from David Edelsohn <dje at gcc dot gnu.org> ---
I upgraded GDB on gcc119 with GDB 7.9.1 + IBM patches. It may work a little
better.