test: Use global variables to defeat gccgo optimizer.
test: Use global variables to defeat gccgo optimizer.

The gccgo compiler is smart enough to not make something which
is not used.  Use global variables to defeat this
optimization.

R=rsc
CC=golang-dev
http://codereview.appspot.com/2129041

rdp/rogerpack2005-golang,glycerine/jeaten-go-arrayof-structof,scirelli/scirelli-go,mhennings/marcohennings-go,bryanxu/go-zh,bryanxu/go-zh,webfd/go-zh,npe9/noahevans-go9,webfd/go-zh,sanjosh/sanjos100-tipc,npe9/noahevans-go9,scirelli/scirelli-go,Triskite/willstone-goclone,scirelli/scirelli-go,d0f/go-zh,d0f/go-zh,rflanagan/reginaldflanagan-project1,webfd/go-zh,Triskite/willstone-goclone,rflanagan/reginaldflanagan-project1,sanjosh/sanjos100-tipc,webfd/go-zh,mhennings/marcohennings-go,scirelli/scirelli-go,d0f/go-zh,webfd/go-zh,sanjosh/sanjos100-tipc,rflanagan/reginaldflanagan-project1,Triskite/willstone-goclone,npe9/noahevans-go9,rdp/rogerpack2005-golang,d0f/go-zh,rflanagan/reginaldflanagan-project1,webfd/go-zh,scirelli/scirelli-go,rflanagan/reginaldflanagan-project1,mhennings/marcohennings-go,d0f/go-zh,rdp/rogerpack2005-golang,npe9/noahevans-go9,d0f/go-zh,glycerine/jeaten-go-arrayof-structof,sanjosh/sanjos100-tipc,bryanxu/go-zh,glycerine/jeaten-go-arrayof-structof,Triskite/willstone-goclone,webfd/go-zh,bryanxu/go-zh,Triskite/willstone-goclone,rflanagan/reginaldflanagan-project1,npe9/noahevans-go9,scirelli/scirelli-go,d0f/go-zh,d0f/go-zh,rdp/rogerpack2005-golang,bryanxu/go-zh,bryanxu/go-zh,Triskite/willstone-goclone,npe9/noahevans-go9,rdp/rogerpack2005-golang,webfd/go-zh,sanjosh/sanjos100-tipc,rdp/rogerpack2005-golang,glycerine/jeaten-go-arrayof-structof,glycerine/jeaten-go-arrayof-structof,npe9/noahevans-go9,sanjosh/sanjos100-tipc,rdp/rogerpack2005-golang,rflanagan/reginaldflanagan-project1,Triskite/willstone-goclone,scirelli/scirelli-go,glycerine/jeaten-go-arrayof-structof,scirelli/scirelli-go,npe9/noahevans-go9,Triskite/willstone-goclone,rflanagan/reginaldflanagan-project1,glycerine/jeaten-go-arrayof-structof,mhennings/marcohennings-go,sanjosh/sanjos100-tipc,mhennings/marcohennings-go,glycerine/jeaten-go-arrayof-structof,sanjosh/sanjos100-tipc,bryanxu/go-zh,rdp/rogerpack2005-golang,mhennings/marcohennings-go,bryanxu/go-zh,mhennings/marcohennings-go,mhennings/marcohennings-go