Closes #11152

(I removed the `fn main` from the `std::rand` examples to make it consistent with the rest of the codebase.)

`ln_str` caused ICE if `RUST_LOG=rustc::middle::liveness` is given
due to borrow failure.

Closes #11152

The old `rtio-processes` run-pass test is now moved into libstd's `io::process` module, and all process and TCP tests are now run with `iotest!` (both a native and a green version are tested).

All TCP networking on windows is provided by `ws2_32` which is apparently very similar to unix networking (hurray!).

`ln_str` caused ICE if `RUST_LOG=rustc::middle::liveness` is given
due to borrow failure.

This also appears to fix a race in LLVM that was causing a deadlock on the bots
during the doc-test tests (where we use rustc in parallel).

This also appears to fix a race in LLVM that was causing a deadlock on the bots
during the doc-test tests (where we use rustc in parallel).

Rename all instances of ClonableIterator to CloneableIterator. This fixes bug https://github.com/mozilla/rust/issues/11132.

Move the tests into libstd, use the `iotest!` macro to test both native and uv
bindings, and use the cloexec trick to figure out when the child process fails
in exec.

This patch changes `result::collect` (and adds a new `option::collect`) from creating a `~[T]` to take an `Iterator`. This makes the function much more flexible, and may replace the need for #10989.

This patch is a little more complicated than it needs to be because of #11084. Once that is fixed we can replace the `CollectIterator` with a `Scan` iterator.

It also fixes a test warning.

This ports over @pcwalton's old pull that bitrotted (#5597). Fixes #10039.

r? @pcwalton / @nikomatsakis

Closes #11054

Closes #11054

r? @alexcrichton

This is the last `@mut` in `librustc` that does not depend on libsyntax.