runtime: remove unused size argument from hash/equal fns

The size argument was removed from hash and equal functions in CL
34983.  Somehow I missed removing them from three of the predefined
functions.

Change-Id: Ied908194ce957ae47169ea986f17703133bcdb6b
Reviewed-on: https://go-review.googlesource.com/40770
Reviewed-by: Than McIntosh <thanm@google.com>
1 file changed