Update LLVM

[tmandry]

Fixes #67855 (rust-lang/llvm-project#31)
Fixes #66036 (rust-lang/llvm-project#32)

r? @nikic @alexcrichton

[rust-highfive]

⚠️ Warning ⚠️

• These commits modify submodules.

[alexcrichton]

@bors: r+

[bors]

📌 Commit 13a91a8 has been approved by alexcrichton

[Centril]

@bors rollup=never

[rust-highfive]

The job x86_64-gnu-tools of your PR failed (pretty log, raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

2020-01-21T23:13:00.6781944Z ========================== Starting Command Output ===========================
2020-01-21T23:13:00.6784613Z [command]/bin/bash --noprofile --norc /home/vsts/work/_temp/b1444f29-6151-4d61-a6de-7ea54d19284b.sh
2020-01-21T23:13:00.6784650Z 
2020-01-21T23:13:00.6788411Z ##[section]Finishing: Disable git automatic line ending conversion
2020-01-21T23:13:00.6793449Z ##[section]Starting: Checkout rust-lang/rust@refs/pull/68435/merge to s
2020-01-21T23:13:00.6795331Z Task         : Get sources
2020-01-21T23:13:00.6795885Z Description  : Get sources from a repository. Supports Git, TfsVC, and SVN repositories.
2020-01-21T23:13:00.6795921Z Version      : 1.0.0
2020-01-21T23:13:00.6795953Z Author       : Microsoft
---
2020-01-21T23:13:01.5752891Z ##[command]git remote add origin https://github.com/rust-lang/rust
2020-01-21T23:13:01.5842508Z ##[command]git config gc.auto 0
2020-01-21T23:13:01.5917367Z ##[command]git config --get-all http.https://github.com/rust-lang/rust.extraheader
2020-01-21T23:13:01.5989092Z ##[command]git config --get-all http.proxy
2020-01-21T23:13:01.6133925Z ##[command]git -c http.extraheader="AUTHORIZATION: basic ***" fetch --force --tags --prune --progress --no-recurse-submodules --depth=2 origin +refs/heads/*:refs/remotes/origin/* +refs/pull/68435/merge:refs/remotes/pull/68435/merge
---
2020-01-22T01:45:50.4752445Z Verifying status of clippy-driver...
2020-01-22T01:45:50.4752796Z Verifying status of miri...
2020-01-22T01:45:50.4753291Z Verifying status of embedded-book...
2020-01-22T01:45:50.4753666Z Verifying status of rustc-guide...
2020-01-22T01:45:50.4754224Z error: Tool `clippy-driver` should be test-pass but is build-fail during beta week.
2020-01-22T01:45:50.4758493Z Build completed unsuccessfully in 0:00:01
2020-01-22T01:45:50.4813279Z == clock drift check ==
2020-01-22T01:45:50.4825862Z   local time: Wed Jan 22 01:45:50 UTC 2020
2020-01-22T01:45:51.0399637Z   network time: Wed, 22 Jan 2020 01:45:51 GMT
2020-01-22T01:45:51.0399637Z   network time: Wed, 22 Jan 2020 01:45:51 GMT
2020-01-22T01:45:51.0402218Z == end clock drift check ==
2020-01-22T01:45:51.3743772Z 
2020-01-22T01:45:51.3852176Z ##[error]Bash exited with code '1'.
2020-01-22T01:45:51.3864377Z ##[section]Finishing: Run build
2020-01-22T01:45:51.3885127Z ##[section]Starting: Checkout rust-lang/rust@refs/pull/68435/merge to s
2020-01-22T01:45:51.3887757Z Task         : Get sources
2020-01-22T01:45:51.3887805Z Description  : Get sources from a repository. Supports Git, TfsVC, and SVN repositories.
2020-01-22T01:45:51.3887852Z Version      : 1.0.0
2020-01-22T01:45:51.3887915Z Author       : Microsoft
2020-01-22T01:45:51.3887915Z Author       : Microsoft
2020-01-22T01:45:51.3887962Z Help         : [More Information](https://go.microsoft.com/fwlink/?LinkId=798199)
2020-01-22T01:45:51.3888012Z ==============================================================================
2020-01-22T01:45:51.8335128Z Cleaning any cached credential from repository: rust-lang/rust (GitHub)
2020-01-22T01:45:51.8380559Z ##[section]Finishing: Checkout rust-lang/rust@refs/pull/68435/merge to s
2020-01-22T01:45:51.8506520Z Cleaning up task key
2020-01-22T01:45:51.8507869Z Start cleaning up orphan processes.
2020-01-22T01:45:51.8630264Z Terminate orphan process: pid (4095) (python)
2020-01-22T01:45:51.8898310Z ##[section]Finishing: Finalize Job

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

[bors]

⌛ Testing commit 13a91a8 with merge e0bbe79...

[bors]

☀️ Test successful - checks-azure
Approved by: alexcrichton
Pushing e0bbe79 to master...