message: Use popc flags -Oz -NDEBUG
  Summary: Use more extensive popc flags
  Test Plan: Just build the system
  Reviewers: samk, timh
diff: @@ -13,7 +13,7 @@ genrule(
  srcs = ["vertices/tf.cpp"],
  outs = ["tf.gp"],
  tools = ["@local_config_poplar//poplar:popc"],
  - cmd = "$(location @local_config_poplar//poplar:popc) -I . -o $@ $<",
  + cmd = "$(location @local_config_poplar//poplar:popc) -DNDEBUG -O3 -I . -o $@ $<",
  )
  tf_proto_library(
  