[DO NOT MERGE] Use rayon's latch-target-thread from spastorino repo

[spastorino]

The whole purpose of this PR to run performance tests so please do not merge.

[spastorino]

@bors try

Now without yield_now calls

[bors]

⌛ Trying commit d137d5d with merge 31e87cb5a2dc7dde7a69de1e09c8fb5ab48b1856...

[rust-highfive]

The job x86_64-gnu-llvm-6.0 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.

2019-11-21T15:08:39.9460283Z ##[command]git remote add origin https://github.com/rust-lang/rust
2019-11-21T15:08:39.9681933Z ##[command]git config gc.auto 0
2019-11-21T15:08:39.9746673Z ##[command]git config --get-all http.https://github.com/rust-lang/rust.extraheader
2019-11-21T15:08:39.9805519Z ##[command]git config --get-all http.proxy
2019-11-21T15:08:39.9954754Z ##[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/66608/merge:refs/remotes/pull/66608/merge
---
2019-11-21T15:11:59.3291645Z #################################################                         68.8%
2019-11-21T15:11:59.3291744Z ######################################################################## 100.0%
2019-11-21T15:11:59.7710818Z extracting /checkout/obj/build/cache/2019-11-06/cargo-beta-x86_64-unknown-linux-gnu.tar.gz
2019-11-21T15:11:59.8599561Z     Updating crates.io index
2019-11-21T15:12:06.7479880Z     Updating git repository `https://github.com/spastorino/rustc-rayon`
---
2019-11-21T15:14:56.8193061Z * highest error code: E0744
2019-11-21T15:14:57.2204444Z * 270 features
2019-11-21T15:14:57.9343470Z Dependencies not on the whitelist:
2019-11-21T15:14:57.9344883Z * crossbeam-channel 
2019-11-21T15:14:57.9350799Z invalid source: "git+https://github.com/spastorino/rustc-rayon?branch=latch-target-thread-rustc#dd85f978633ae564515b7d1c82ba3d1cff76b1f1"
2019-11-21T15:14:57.9351597Z invalid source: "git+https://github.com/spastorino/rustc-rayon?branch=latch-target-thread-rustc#dd85f978633ae564515b7d1c82ba3d1cff76b1f1"
2019-11-21T15:14:58.1940954Z some tidy checks failed
2019-11-21T15:14:58.1946020Z Found 441 error codes
2019-11-21T15:14:58.1946332Z Found 0 error codes with no tests
2019-11-21T15:14:58.1946764Z Done!
2019-11-21T15:14:58.1946764Z Done!
2019-11-21T15:14:58.1952902Z 
2019-11-21T15:14:58.1953180Z 
2019-11-21T15:14:58.1954664Z command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-tools-bin/tidy" "/checkout/src" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/cargo" "--no-vendor"
2019-11-21T15:14:58.1955964Z 
2019-11-21T15:14:58.1956275Z 
2019-11-21T15:14:58.1956478Z failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test src/tools/tidy
2019-11-21T15:14:58.1956630Z Build completed unsuccessfully in 0:01:33
2019-11-21T15:14:58.1956630Z Build completed unsuccessfully in 0:01:33
2019-11-21T15:14:58.1999680Z == clock drift check ==
2019-11-21T15:14:58.2008292Z   local time: Thu Nov 21 15:14:58 UTC 2019
2019-11-21T15:14:58.4859302Z   network time: Thu, 21 Nov 2019 15:14:58 GMT
2019-11-21T15:14:58.4859411Z == end clock drift check ==
2019-11-21T15:14:59.7557073Z 
2019-11-21T15:14:59.7670767Z ##[error]Bash exited with code '1'.
2019-11-21T15:14:59.7702390Z ##[section]Starting: Checkout
2019-11-21T15:14:59.7704091Z ==============================================================================
2019-11-21T15:14:59.7704147Z Task         : Get sources
2019-11-21T15:14:59.7704209Z Description  : Get sources from a repository. Supports Git, TfsVC, and SVN repositories.

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]

💥 Test timed out

[spastorino]

@bors retry

[bors]

⌛ Trying commit d137d5d with merge b2f8ba5...

[bors]

💥 Test timed out

[spastorino]

@bors retry

[bors]

⌛ Trying commit d137d5d with merge 05f35762238635c54155f71e529c13bca0ef12de...

[bors]

☀️ Try build successful - checks-azure
Build commit: 05f35762238635c54155f71e529c13bca0ef12de (05f35762238635c54155f71e529c13bca0ef12de)

[spastorino]

Experiment is over.