One of the things changing in Go 1.1 is the size of int, necessitating updates of all
the assembly functions that have unsized ints as arguments or results. 

code.google.com/p/rsc/cmd/asmlint is the tool I wrote to read Go forward declaration and
scan assembly listings for incorrect offsets or type mismatches. This is what I used to
update the Go tree when we made the change.

Now that cmd/vet knows about build.Packages, it should be straightforward to drop this
code into a new vet module and have it emit errors. The asmlint command also has a
"fix everything" mode, but we could drop or disable that for integration with
vet. I think it suffices to report the errors.

https://code.google.com/p/rsc/source/browse/cmd/asmlint/main.go