[PATCH i386][google]With -mtune=core2, avoid generating the slow unaligned vector load/store (issue 5488054)

[davidxl@google.com]

http://codereview.appspot.com/5488054/diff/4002/tree-vect-stmts.c
File tree-vect-stmts.c (right):

http://codereview.appspot.com/5488054/diff/4002/tree-vect-stmts.c#newcode3712
tree-vect-stmts.c:3712: }
The check can be put into a helper function.

http://codereview.appspot.com/5488054/