These targets cover OpenWRT 15.05 devices, which use the soft float ABI
and the uclibc library. None of the other built-in mips targets covered
those devices (mips-gnu is hard float and glibc-based, mips-musl is
musl-based).

With this commit one can now build std for these devices using these
commands:

```
$ configure --enable-rustbuild --target=mips-unknown-linux-uclibc
$ make
```

cc rust-lang#35673

The minimum got bumped in the LLVM upgrade of rust-lang#34743.

It is still advertised by the configure script.

Issue rust-lang#35697 as a part of rust-lang#35233.
r? @jonathandturner

Fixes rust-lang#35737

As a part of issue rust-lang#35233
?r @GuillaumeGomez

…handturner

Update compiler error 0093 to use new error format

Addresses rust-lang#35230, Part of the rust-lang#35233 meta bug

r? @jonathandturner

add mips-uclibc targets

These targets cover OpenWRT 15.05 devices, which use the soft float ABI
and the uclibc library. None of the other built-in mips targets covered
those devices (mips-gnu is hard float and glibc-based, mips-musl is
musl-based).

With this commit one can now build std for these devices using these
commands:

```
$ configure --enable-rustbuild --target=mips-unknown-linux-uclibc
$ make
```

cc rust-lang#35673

---

r? @alexcrichton
cc @felixalias This is the target the rust-tessel project should be using.
Note that the libc crate doesn't support the uclibc library and will have to be updated. We are lucky that uclibc and glibc are somewhat similar and one can build std and even run the libc-test test suite with the current, unmodified libc. About that last part, I tried to run the libc-test and got a bunch of compile errors. I don't intend to fix them but I'll post some instruction about how to run libc-test in the rust-lang/libc issue tracker.

…t, r=jonathandturner

E0403 update error format

Fixes rust-lang#35696

Part of rust-lang#35233

r? @jonathandturner

Also did the bonus for this one.

Update LLVM to include 4 backported commits by @majnemer.

Partial fix for rust-lang#35662, should help at least loops on small arrays.

Nominated for backporting into the new beta (not the one that's being released as stable this week).

r? @alexcrichton

…omatsakis

Update minimum CMake version in README

The minimum got bumped in the LLVM upgrade of rust-lang#34743.

…dturner

Update E0009 to new format

Part of rust-lang#35233
Fixes rust-lang#35193

r? @jonathandturner

…ndturner

Fixes issue rust-lang#11004

Fixes rust-lang#11004.

r? @jonathandturner

Add 'make help' for rustbuild

It is still advertised by the configure script.

Fix the invalidation of the MIR early exit cache

~~The rust-lang#34307 introduced a cache for early exits in order to help with O(n*m) explosion of cleanup blocks but the cache is invalidated incorrectly and I can’t seem to figure out why (caching is hard!)~~

~~Remove the cache for now to fix the immediate correctness issue and worry about the performance later.~~

Cache invalidation got fixed.

Fixes rust-lang#35737

r? @nikomatsakis

…omez

New output for E0407

Issue rust-lang#35697 as a part of rust-lang#35233.
r? @GuillaumeGomez

…rner

Additional span info for E0053

Part of rust-lang#35233.
Fixes rust-lang#35212.

r? @jonathandturner

…ndturner

Add new error code tests

r? @jonathandturner

…urner

Updated test for E0221

As a part of issue rust-lang#35233
?r @GuillaumeGomez