utf8.String: provide an Init method to avoid unnecessary allocation when creating an array of Strings.
utf8.String: provide an Init method to avoid unnecessary allocation
when creating an array of Strings.

R=rsc
CC=golang-dev
http://codereview.appspot.com/2267046

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