librustc: Allow linkage attribute on any statics, not just foreign statics.
librustc: Respect no-compiler-rt target option for static libs as well.
convert 1 line match to 2 lines for readability
Expand the benchmarking and unit test suite for ring_buf.
-Adds unit tests for fn get() and fn get_mut() which are currently untested
-Adds unit tests to verify growth of the ringbuffer when reserve is called.
-Adds unit tests to confirm that dropping of items is correct
Move ringbuf to use a raw buffer instead of Option<T>
Handle allocate/reallocate errors in ring_buf
Use is_some() in clear to simplify the clear loop.
Added some extra debug_asserts to ring_buf.
Manually reset the ringbuffer before or after the ringbuffer push/pop tests.
Added population count assertion in reserve. Cleaned up wrap_index.
Add `Show` and `Clone` trait to arrays

Due to not being able to parametrize over array sizes, `Clone` is only
implemented for element types that are `Copy`able.
libstd: improve os::args() doc
Guide: add a pointer to play.rust-lang.org and explain how to run the code examples.
Update ring_buf.rs from fallout of #18827.
implement cloned for Option
Deprecate hashmap's find_copy and get_copy in favour of cloned and clone
fallout from deprecating find_copy and get_copy
Fixed several typos in libcollections
Implement more basic traits for the marker types.
auto merge of #18747 : csherratt/rust/ringbuf-remove-option, r=huonw

Fix for task in Metabug #18009 (Rebased version of https://github.com/rust-lang/rust/pull/18170)

This changes much of about how RingBuf functions. `lo`, `nelts` are replaced by a more traditional `head` and`tail`. The `Vec<Option<T>>` is replaced by a bare pointer that is managed by the `RingBuf` itself. This also expects the ring buffer to always be size that is a power of 2.

This change also includes a number of new tests to cover the some areas that could be of concern with manual memory management.

The benchmarks have been reworked since the old ones were benchmarking of the Ring buffers growth rather then the actual test.

The unit test suite have been expanded, and exposed some bugs in `fn get()` and `fn get_mut()`

## Benchmark
**Before:**
```
test ring_buf::tests::bench_grow_1025                      ... bench:      8919 ns/iter (+/- 87)
test ring_buf::tests::bench_iter_1000                      ... bench:       924 ns/iter (+/- 28)
test ring_buf::tests::bench_mut_iter_1000                  ... bench:       918 ns/iter (+/- 6)
test ring_buf::tests::bench_new                            ... bench:        15 ns/iter (+/- 0)
test ring_buf::tests::bench_pop_100                        ... bench:       294 ns/iter (+/- 9)
test ring_buf::tests::bench_pop_front_100                  ... bench:       948 ns/iter (+/- 32)
test ring_buf::tests::bench_push_back_100                  ... bench:       291 ns/iter (+/- 16)
test ring_buf::tests::bench_push_front_100                 ... bench:       311 ns/iter (+/- 27
```
**After:**
```
test ring_buf::tests::bench_grow_1025                      ... bench:      2209 ns/iter (+/- 169)
test ring_buf::tests::bench_iter_1000                      ... bench:       534 ns/iter (+/- 27)
test ring_buf::tests::bench_mut_iter_1000                  ... bench:       515 ns/iter (+/- 28)
test ring_buf::tests::bench_new                            ... bench:        11 ns/iter (+/- 0)
test ring_buf::tests::bench_pop_100                        ... bench:       170 ns/iter (+/- 5)
test ring_buf::tests::bench_pop_front_100                  ... bench:       171 ns/iter (+/- 11)
test ring_buf::tests::bench_push_back_100                  ... bench:       172 ns/iter (+/- 13)
test ring_buf::tests::bench_push_front_100                 ... bench:       158 ns/iter (+/- 12)

```
Fixed a few typos in libcore
auto merge of #18927 : areski/rust/pr-improve-option-match-readl, r=jakub-

**match** are much more easy to read when it's not in 1 single line