Comment 10 for bug 1567219

dwz is completely different thing. dwz optimizes dwarf data while objdump just compress (zlib)
whole sections. the difference is visible on non-trivial shared objects compiled with -g2 in few ways:

1). when you have a big application with 200+ big shared objects in use
then the gdb startup time is much shorter with compressed debug info.
this is a major benefit for debug/build/debug cycles.

2). relinking libraries is faster (linker reads/writes less data from deps
with compressed sections). one more benefit for debug/build cycles.

3). objdump compression is more effective than dwz.

170M libgenChip.so
  65M libgenChip.so.zdebug

148M libgenChip.so.dwz
  60M libgenChip.so.dwz.zdebug