Migrate all users of opt_vec to owned_slice, delete opt_vec.

syntax::opt_vec is now entirely unused, and so can go.
auto merge of #13043 : alexcrichton/rust/fix-rustdoc-windows, r=brson

If the dwShareMode parameter is 0 on windows, it "prevents other processes from
opening a file or device if they request delete, read, or write access", which
is the opposite of what we want! This changes the 0 parameter to something which
will allow multiple processes to open the file and then lock it.
auto merge of #12833 : alexcrichton/rust/libnative, r=brson

The compiler will no longer inject libgreen as the default runtime for rust
programs, this commit switches it over to libnative by default. Now that
libnative has baked for some time, it is ready enough to start getting more
serious usage as the default runtime for rustc generated binaries.

We've found that there isn't really a correct decision in choosing a 1:1 or M:N
runtime as a default for all applications, but it seems that a larger number of
programs today would work more reasonably with a native default rather than a
green default.

With this commit come a number of bugfixes:

* The main native task is now named `<main>`
* The main native task has the stack bounds set up properly
* #[no_uv] was renamed to #[no_start]
* The core-run-destroy test was rewritten for both libnative and libgreen and
  one of the tests was modified to be more robust.
* The process-detach test was locked to libgreen because it uses signal handling
auto merge of #13016 : huonw/rust/new-opt-vec, r=cmr

Replace syntax::opt_vec with syntax::owned_slice

The `owned_slice::OwnedSlice` is  `(*T, uint)` (i.e. a direct equivalent to DSTs `~[T]`).

This shaves two words off the old OptVec type; and also makes substituting in other implementations easy, by removing all the mutation methods. (And also everything that's very rarely/never used.)
auto merge of #13036 : alexcrichton/rust/atomics, r=alexcrichton

Closes #11583, rebasing of #12430 now that we've got `Share` and better analysis with statics.
auto merge of #13051 : alexcrichton/rust/issue-13047, r=thestinger

It's useful for structures which use deriving(Clone), even though it's
implicitly copyable.

Closes #13047
auto merge of #12907 : alexcrichton/rust/issue-12892, r=brson

These methods can be mistaken for general "read some bytes" utilities when
they're actually only meant for reading an exact number of bytes. By renaming
them it's much clearer about what they're doing without having to read the
documentation.

Closes #12892
native: Fix a possible deadlock in spawn

The OSX bots have been deadlocking recently in the rustdoc tests. I have only
been able to rarely reproduce the deadlock on my local setup. When reproduced,
it looks like the child process is spinning on the malloc mutex, which I
presume is locked with no other threads to unlock it.

I'm not convinced that this is what's happening, because OSX should protect
against this with pthread_atfork by default. Regardless, running as little code
as possible in the child after fork() is normally a good idea anyway, so this
commit moves all allocation to the parent process to run before the child
executes.

After running 6k iterations of rustdoc tests, this deadlocked twice before, and
after 20k iterations afterwards, it never deadlocked. I draw the conclusion that
this is either sweeping the bug under the rug, or it did indeed fix the
underlying problem.
auto merge of #13052 : sfackler/rust/clean-refcell, r=alexcrichton

These are superfluous now that we have fixed rvalue lifetimes and Deref.

I'd also like to kill off `get` and `set`, but that'll be a large change so I want to make sure that we actually want to do that first.
auto merge of #13062 : mbrubeck/rust/doc-edit, r=alexcrichton

This is a very minor edit to the tutorial section on references.

Reading this section for the first time, I stumbled on the phrase "a reference can be borrowed to any object."  Its meaning was clear enough once I got it, but I had to re-read it a couple of times to parse it correctly.  Something about the passive voice plus the way "reference to any object" is split up by the verb phrase.  How about this instead?
rustc: Remove special treatment for Freeze and NoFreeze

Fixes #12577
arena: Remove Freeze / NoFreeze
sync: Remove Freeze / NoFreeze
std::comm: Remove Freeze / NoFreeze
cell: Remove Freeze / NoFreeze
std: Remove the Freeze kind and the NoFreeze marker
test: Remove Freeze / NoFreeze from tests
doc: Remove Freeze / NoFreeze from docs
std::os: Handle FormatMessage failure

`FormatMessageW()` is called by `std::os::last_os_error()` to convert
errno into string, but the function may fail on non-english locale.
I don't know why it fails, but anyway it's better to return errno
than to `fail!()` in the case.

Fixes #13075
Fixes #13073
auto merge of #13078 : klutzy/rust/issue-13075, r=alexcrichton

`FormatMessageW()` is called by `std::os::last_os_error()` to convert
errno into string, but the function may fail on non-english locale.
I don't know why it fails, but anyway it's better to return errno
than to `fail!()` in the case.

Fixes #13075
Fixes #13073