Disable no-section-anchors-vect-68.C for aarch64 tiny memory model.

The vect/no-section-anchors-vect-68.C test case results in a binary that
is too large for the aarch64 tiny memory model.  This patch disables the
test case for that memory model.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@199720 138bc75d-0d04-0410-961f-82ee72b054a4