Make vertex registers members of routine classes.

Bug 22652760

Change-Id: I698ce910ee4302178d7235fa316aaa2b268e71a8
Reviewed-on: https://swiftshader-review.googlesource.com/4560
Tested-by: Nicolas Capens <capn@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>
5 files changed