gcc: Add patch for PR middle-end 60484

.. to fix dumping for compiler and optimisation stages:

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60484

Have run into ICE (OOM?) building blender-git due to
an issue with ceres-solver or Eigen .. probably
template meta programming goes haywire with -1 integer
values not reaching terminal specialisation cases before
all memory is exhausted.