bors 0777c757a6 Auto merge of #40123 - TimNN:llvm40, r=alexcrichton ...

LLVM 4.0 Upgrade

Since nobody has done this yet, I decided to get things started:

**Todo:**

* [x] push the relevant commits to `rust-lang/llvm` and `rust-lang/compiler-rt`
* [x] cleanup `.gitmodules`
* [x] Verify if there are any other commits from `rust-lang/llvm` which need backporting
* [x] Investigate / fix debuginfo ("`<optimized out>`") failures
* [x] Use correct emscripten version in docker image

---

Closes #37609.

---

**Test results:**

Everything is green 🎉

2017-04-24 22:18:16 +00:00

..

build.rs

FIN: build comiler-rt wihout Thumb on arm

2017-04-23 22:00:02 +02:00

Cargo.toml

Add/remove rerun-if-changed when necessary

2017-03-04 21:38:26 +03:00

lib.rs

Fixed invalid 128-bit division on 32-bit target. Fixed issue #41228.

2017-04-13 00:15:04 +08:00