Move trait impls for primitives near trait definition

Closes #12925
std: Remove format_strbuf!()

This was only ever a transitionary macro.
Issue #13933: Remove transmute_mut from IO

The IO libraries casted self to mut so they can pass it to seek(SEEK_CUR, 0).
Fix this by introducing a private seek function that takes &self
  - of course one should be careful with it if he lacks an
    exclusive reference to self.
auto merge of #14437 : Sawyer47/rust/utf16-items, r=alexcrichton

According to Rust's style guide acronyms should be CamelCase.
Issue #13933: Remove transmute_mut from Arc

directly use the internal pointer instead.
rustc: Accept PartialOrd/PartialOrdEq for Eq/Ord

This is a transitionary step towards completing #12517. This change modifies the
compiler to accept Partial{Ord,Eq} as deriving modes which will currently expand
to implementations of PartialOrd and PartialEq (synonyms for Eq/Ord).

After a snapshot, all of deriving(Eq, Ord) will be removed, and after a snapshot
of that, TotalEq/TotalOrd will be renamed to Eq/Ord.
auto merge of #13738 : buttslol/rust/armv7-support, r=alexcrichton

This was required to get ./configure to work on my armv7 test machine.

I haven't found anything sane to feature gate `hf` on that's pokable from the context of the configure script.

It also seems that gcc doesn't work on armv7 by default (rust wants to pass it `-m32` which isn't supported), would it be preferential to make the default `--enable-clang` on arm, or remove the `-m32` flag on that platform?
auto merge of #14464 : Sawyer47/rust/issue-12925, r=alexcrichton

This is an attempt of fixing #12925.

This PR moves almost all trait implementations for primitive types ((), bool, char, i*, u*, f*) near trait definitions. Only Float trait implementations weren't moved because they heavily rely on constants defined in f32.rs and f64.rs.

Some trait implementations had cfg(not(test)) attribute. I suspect it's because of issue 2912.
Still, someone who knows the problem better should probably check this code.

Closes #12925
Silence warning in RefCell test suite
Add AST node for pattern macros
Add patterns to MacResult
Expand macros in patterns
Parse macros in patterns

Fixes #6830.
Test pattern macros
auto merge of #14298 : kmcallister/rust/pattern-macros, r=huonw

First commit is an unrelated fix for a test suite warning I introduced last week.
auto merge of #14465 : Ryman/rust/patch-1, r=alexcrichton
auto merge of #14476 : luqmana/rust/docs, r=alexcrichton

We were still generating compiler docs even with --disable-docs passed.

cc @pnkfelix
Don't enable libcpp for llvm by default.
auto merge of #14451 : alexcrichton/rust/issue-14442, r=brson

This avoids having to perform conversions from `*u8` to `&'static str` which can
suck in a good deal of code.

Closes #14442
Replace StrAllocating.into_owned() with .into_string()

We already have into_string(), but it was implemented in terms of
into_owned(). Flip it around and deprecate into_owned().

Remove a few spurious calls to .into_owned() that existed in libregex
and librustdoc.