Remove the explicit SUnitIterator::operator= as the default is just fine

Remove the explicit SUnitIterator::operator= as the default is just fine

There doesn't seem to be any need to assert that iterator assignment is
between iterators over the same node - if you want to reuse an iterator
variable to iterate another node, that's perfectly acceptable. Just
don't mix comparisons between iterators into disjoint sequences, as
usual.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231134 91177308-0d34-0410-b5e6-96231b3b80d8