This patch just adds the required return statements to slice_array::operator=
and mask_array::operator=.
Tests were added to check that the return value is the same as the object assigned
to.
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@215414 91177308-0d34-0410-b5e6-96231b3b80d8
