[Bug c/50353] vec_set not used for vector indexing

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50353

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2011-09-11 
23:26:47 UTC ---
I think at -O0 this is ok, at -O1 and above should have removed the
TREE_ADDRESABLE on the variable already.