[libc++] NFC: Move iterator.range tests into the right place

They seem to have been placed under stream.iterators by mistake.
This is relevant for some upcoming UNSUPPORTED markup.

diff --git a/libcxx/test/std/iterators/stream.iterators/iterator.range/begin_array.pass.cpp b/libcxx/test/std/iterators/iterator.range/begin_array.pass.cpp
similarity index 100%
rename from libcxx/test/std/iterators/stream.iterators/iterator.range/begin_array.pass.cpp
rename to libcxx/test/std/iterators/iterator.range/begin_array.pass.cpp

diff --git a/libcxx/test/std/iterators/stream.iterators/iterator.range/begin_const.pass.cpp b/libcxx/test/std/iterators/iterator.range/begin_const.pass.cpp
similarity index 100%
rename from libcxx/test/std/iterators/stream.iterators/iterator.range/begin_const.pass.cpp
rename to libcxx/test/std/iterators/iterator.range/begin_const.pass.cpp

diff --git a/libcxx/test/std/iterators/stream.iterators/iterator.range/begin_non_const.pass.cpp b/libcxx/test/std/iterators/iterator.range/begin_non_const.pass.cpp
similarity index 100%
rename from libcxx/test/std/iterators/stream.iterators/iterator.range/begin_non_const.pass.cpp
rename to libcxx/test/std/iterators/iterator.range/begin_non_const.pass.cpp

diff --git a/libcxx/test/std/iterators/stream.iterators/iterator.range/end_array.pass.cpp b/libcxx/test/std/iterators/iterator.range/end_array.pass.cpp
similarity index 100%
rename from libcxx/test/std/iterators/stream.iterators/iterator.range/end_array.pass.cpp
rename to libcxx/test/std/iterators/iterator.range/end_array.pass.cpp

diff --git a/libcxx/test/std/iterators/stream.iterators/iterator.range/end_const.pass.cpp b/libcxx/test/std/iterators/iterator.range/end_const.pass.cpp
similarity index 100%
rename from libcxx/test/std/iterators/stream.iterators/iterator.range/end_const.pass.cpp
rename to libcxx/test/std/iterators/iterator.range/end_const.pass.cpp

diff --git a/libcxx/test/std/iterators/stream.iterators/iterator.range/end_non_const.pass.cpp b/libcxx/test/std/iterators/iterator.range/end_non_const.pass.cpp
similarity index 100%
rename from libcxx/test/std/iterators/stream.iterators/iterator.range/end_non_const.pass.cpp
rename to libcxx/test/std/iterators/iterator.range/end_non_const.pass.cpp