When the tree is particularly broken,
even the first invocation of bench binary that queries list
of benchmarks can hang.
Fixesgolang/go#8844.
LGTM=bradfitz
R=adg, bradfitz
CC=golang-codereviews
https://golang.org/cl/162160043
They were from a time before we had the os/exec package, if
memory serves.
Also, make verbose also mean that the main build's stdout
and stderr go to the real stdout and stderr as well.
I'll want that for the Docker-based builder.
LGTM=adg
R=adg
CC=golang-codereviews
https://golang.org/cl/135000043
This CL moves code from code.google.com/p/dvyukov-go-perf-dashboard,
which was previously reviewed.
LGTM=adg
R=adg
CC=golang-codereviews
https://golang.org/cl/95190043
