cmd/compile: non-deterministic build blocking use of toolstash-check

[mdempsky]

At master, running toolstash-check on a CL that just adds a comment to cmd/compile causes this failure:

# html/template
toolstash: compiler output differs, even with optimizers disabled (-N)

inconsistent log line:
/tmp/go-build151744301/html/template.a.log:84904:
        type..namedata.**template.Template. t=8 dupok size=22
/tmp/go-build151744301/html/template.a.stash.log:84904:
        type..namedata.*[]uint8. t=8 dupok size=11

@griesemer is seeing the same thing. It appears to be from CL 39710.

@josharian It looks like LongString isn't a total ordering either. :(

[gopherbot]

CL https://golang.org/cl/39871 mentions this issue.

[josharian]

I'm an idiot. I missed the obviously correct ordering, which is to do what the actual export code (dtypesym) does.

[gopherbot]

CL https://golang.org/cl/39915 mentions this issue.