Fleet run 75 @110b9230: 28554/28598 pass, 32 failures

Six-arch full fleet run (14299 binaries x 2 frontends).

  mips64  fault       17   redis-server.clang.* (10), tar.clang.O0.* (8 incl rida)
  mips64  xform_fail   9   redis-server.gcc.Ofast.*, redis-server.gcc.O3.pie.nostrip
  x86-32  fault        4   bind.clang.O0.pie.{nostrip,strip}  -- master faults identically
  mips32  xform_fail   1   redis-server.clang.O2.pie.strip
  x86-64  xform_fail   1   monero.gcc.O1.pie.nostrip ida -- map::at, predates this branch

Five commits on the branch:
  538f4c7d pad-nop            (fleet-confirmed run 71)
  f70a680c fallen-into        (fleet-confirmed, 7/7 cells)
  b626b909 meds2pdb orphan
  4956ddd5 lo_gp / _gp_disp
  110b9230 dollop chain re-walk (mips64 bind 14.8h -> 3min)