Don't bother distinguishing between big end little endian targets.
There are currently no tests which need this.

"mov" is not a valid assembly mnemonic on mips.

Since rust-lang#47964 was merged, 64-bit mips started passing all structures
using 64-bit chunks regardless of their contents. The
repr-transparent-aggregates tests needs updating to cope with this.

This commit removes some ThinLTO/codegen unit cruft primarily only needed during
the initial phase where we were adding ThinLTO support to rustc itself. The
current bootstrap compiler knows about ThinLTO and has it enabled by default for
multi-CGU builds which are also enabled by default. One CGU builds (aka
disabling ThinLTO) can be achieved by configuring the number of codegen units to
1 for a particular builds.

This also changes the defaults for our dist builders to go back to multiple
CGUs. Unfortunately we're seriously bleeding for cycle time on the bots right
now so we need to recover any time we can.

It actually was already using the `cabi_asmjs` module but that was by accident,
so route the new `wasm32-unknown-unknown` target to a new `cabi_wasm32` module.
The first entries in this module are to use `signext` and `zeroext` for types
that are under 32 bytes in size

Closes rust-lang-nursery/rust-wasm#88

This'll help us bind the [`SHA` intrinsics][intr] in stdsimd!

[intr]: https://software.intel.com/sites/landingpage/IntrinsicsGuide/#othertechs=SHA

See rust-lang#47945.

A broken test to be fixed in the next commit.

Fixes rust-lang#44798 and rust-lang/cargo#4948.

 Current model of threating small aggregate returns as smallest encompassing integer works only for little-endian mips64.
 The patch forces small aggregate return values to be viewed as one or two i64 chunks leaving to the casting implementation
 to handle endianes differences.

Follow up to rust-lang#47574.

…tebank

Add crate name to "main function not found" error message.

Fixes rust-lang#44798 and rust-lang/cargo#4948.

I was wondering if it might be cleaner to update the ui tests to add a simple `fn main() {}` for the unrelated tests.  Let me know if you would prefer that.

MIPS testsuite fixes

This PR adjusts various bits in the testsuite so that more stuff passes on mips*.

…Simulacrum

rustbuild: Remove ThinLTO-related configuration

This commit removes some ThinLTO/codegen unit cruft primarily only needed during
the initial phase where we were adding ThinLTO support to rustc itself. The
current bootstrap compiler knows about ThinLTO and has it enabled by default for
multi-CGU builds which are also enabled by default. One CGU builds (aka
disabling ThinLTO) can be achieved by configuring the number of codegen units to
1 for a particular builds.

This also changes the defaults for our dist builders to go back to multiple
CGUs. Unfortunately we're seriously bleeding for cycle time on the bots right
now so we need to recover any time we can.

Implement import renaming with `_` (RFC 2166)

cc rust-lang#48216

Dedupe rand

rustc: Start a custom cabi module for wasm32

It actually was already using the `cabi_asmjs` module but that was by accident,
so route the new `wasm32-unknown-unknown` target to a new `cabi_wasm32` module.
The first entries in this module are to use `signext` and `zeroext` for types
that are under 32 bytes in size

Closes rust-lang-nursery/rust-wasm#88

…ns, r=GuillaumeGomez

Rustdoc: example of use of assertions

I added this section at the beginning of the file because it seems to be basic information. Let me know if there's someplace more relevant.

See rust-lang#47945.

rustc: Add `sha` to the x86 feature whitelist

This'll help us bind the [`SHA` intrinsics][intr] in stdsimd!

[intr]: https://software.intel.com/sites/landingpage/IntrinsicsGuide/#othertechs=SHA

Add a potential cause to `AddrParseError` raising.

Some tweaks to "type parameters from outer function" diagnostic

Follow up to rust-lang#47574.

… r=sanxiyn

 rustc_trans: fix small aggregate returns for big-endian mips64 FFI

 Current model of threating small aggregate returns as smallest encompassing integer works only for little-endian mips64.
 The patch forces small aggregate return values to be viewed as one or two i64 chunks leaving to the casting implementation
 to handle endianes differences.

Remove unnecessary "`" in error message E0307 (invalid self type).

setting ABORTING_MALLOC=0 for asmjs backend

This changes the behaviour of the allocator for asmjs backend.
It will return NULL on OOM instead of aborting and let Rust choose the behaviour.
Fixes rust-lang#48968 and enables try_reserve (fallible allocation) in asmjs.

…ion_improvement, r=GuillaumeGomez

Improve `AddrParseError` documentation.

I've added potential cause to `AddrParseError` raising.

Fix ICE on malformed plugin attributes

See rust-lang#48941 for some discussion.

This bug had several duplicate reports which were never closed as dupes:

Fixes rust-lang#47612
Fixes rust-lang#48387
Fixes rust-lang#48941
Fixes rust-lang#48982

…tsakis

Coherence diagnostic tweaks

…r=bluss

Unstabilize FusedIterator for Flatten since Flatten is unstable

PR rust-lang#47463 made `impl<I, U> FusedIterator for Flatten<I>` stable but shouldn't have since `Flatten` is still unstable. This PR makes the impl unstable again.

…dreavus

Move librustdoc readme to rustc guide

cc rust-lang/rustc-dev-guide#2 and rust-lang#48478

Don't merge this before rust-lang/rustc-dev-guide#86