Added missing memory orderings for atomic types.
Remove unused variables in `compile_submatch`.

Just an minor cleanup.

Signed-off-by: OGINO Masanori <masanori.ogino@gmail.com>
auto merge of #7993 : Xazax-hun/rust/master, r=bblum

Added missing memory orderings for atomic types. https://github.com/mozilla/rust/issues/7422
auto merge of #7982 : thestinger/rust/iterator, r=thestinger

f0f4dcc r=huonw
25e9c4c r=graydon
a87c2d1 r=brson
16f369d r=cmr
9f05cc8 r=bstrie
e858055 r=huonw
5d80938 r=thestinger
05d03e7 r=cmr
8f86fa3 r=thestinger
auto merge of #7997 : omasanori/rust/cleanup, r=cmr

Just an minor cleanup.
rm unused upcall_exchange_free
rm default method lint

default methods are enabled by default, so there's not much point in
keeping around a lint to report them as being experimental
improve container/iterator tutorial