Generate new protobuf pprof profiles with embed symbol info.
This makes program binary unnecessary.

Change-Id: Ie628439c13c5e34199782031138102c83ea50621
Reviewed-on: https://go-review.googlesource.com/21873Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
Run-TryBot: Dmitry Vyukov <dvyukov@google.com>