PATCH for PR18404 - Bug in regex_token_iterator::operator++(int) implementation

[Marshall Clow]

It’s not actually a bug in operator++(int), but rather in the copy constructor and the assignment operator, which causes copied regex_token_iterators to be coupled.

While I was fixing that, I added a drive-by fix in the assignment operator or regex_token_iterator as well:

         if (__x.__result_ == &__x.__suffix_)
-            __result_ == &__suffix_;
+            __result_ = &__suffix_;

i.e, there was a comparison instead of an assignment :-(

Added tests to make sure that the iterators were independent for both regex_iterator and regex_token_iterator.

— Marshall
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