go/gcimporter: cut off any gc-specific parameter numbering

Matching pending CL https://golang.org/cl/22441/.

Change-Id: I96fab1da7abfeb8f22ce680183649dfa4b84d461
Reviewed-on: https://go-review.googlesource.com/22442
Reviewed-by: Alan Donovan <adonovan@google.com>
1 file changed