x/tools/cmd/ssadump: doesn't compile

[bradfitz]

The x/tools build is broken across the board:

https://build.golang.org/log/5caa4ff768a880d6f306a9546cb060eb5e592c29 etc:

# golang.org/x/tools/cmd/ssadump
2017/03/14 14:27:21 duplicate symbol golang.org/x/tools/go/ssa.(*BuilderMode).String (types 1 and 1) in main and $WORK/golang.org/x/tools/go/ssa.a(_go_.o)

[ianlancetaylor]

I think that this was broken by https://golang.org/cl/38139 and I think that the fix is in https://golang.org/cl/38156.

[ianlancetaylor]

CC @dr2chase @philhofer

[philhofer]

Confirmed dupe of #19548.

[josharian]

Closing as dup.

[gopherbot]

CL https://golang.org/cl/38156 mentions this issue.