govet: add Panic to the list of functions
govet: add Panic to the list of functions

R=rsc
CC=golang-dev
http://codereview.appspot.com/4119049

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