Update RLS and Rustfmt

[Xanewok]

Fixes #80576

Updates Rustfmt to use rustfmt-v1.4.31 branch. Both are updated (along with racer) in tandem to pull in the exact same version of rustc-ap-* libraries.

r? @calebcartwright

[rust-highfive]

⚠️ Warning ⚠️

• These commits modify submodules.

[Xanewok]

@bors p=1 delegate=calebcartwright

[bors]

✌️ @calebcartwright can now approve this pull request

[rust-log-analyzer]

The job x86_64-gnu-llvm-9 failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

##################################                                        47.6%
######################################################################## 100.0%
extracting /checkout/obj/build/cache/2020-11-19/rustfmt-nightly-x86_64-unknown-linux-gnu.tar.xz
    Updating crates.io index
error: the lock file /checkout/Cargo.lock needs to be updated but --locked was passed to prevent this
If you want to try to generate the lock file without accessing the network, use the --offline flag.
Build completed unsuccessfully in 0:00:37
make: *** [prepare] Error 1
Makefile:60: recipe for target 'prepare' failed
Command failed. Attempt 2/5:
Command failed. Attempt 2/5:
    Updating crates.io index
error: the lock file /checkout/Cargo.lock needs to be updated but --locked was passed to prevent this
If you want to try to generate the lock file without accessing the network, use the --offline flag.
Build completed unsuccessfully in 0:00:00
make: *** [prepare] Error 1
Makefile:60: recipe for target 'prepare' failed
Command failed. Attempt 3/5:
Command failed. Attempt 3/5:
    Updating crates.io index
error: the lock file /checkout/Cargo.lock needs to be updated but --locked was passed to prevent this
If you want to try to generate the lock file without accessing the network, use the --offline flag.
Build completed unsuccessfully in 0:00:00
make: *** [prepare] Error 1
Makefile:60: recipe for target 'prepare' failed
Command failed. Attempt 4/5:
Command failed. Attempt 4/5:
    Updating crates.io index
error: the lock file /checkout/Cargo.lock needs to be updated but --locked was passed to prevent this
If you want to try to generate the lock file without accessing the network, use the --offline flag.
Build completed unsuccessfully in 0:00:00
make: *** [prepare] Error 1
Makefile:60: recipe for target 'prepare' failed
Command failed. Attempt 5/5:
Command failed. Attempt 5/5:
    Updating crates.io index
error: the lock file /checkout/Cargo.lock needs to be updated but --locked was passed to prevent this
If you want to try to generate the lock file without accessing the network, use the --offline flag.
Build completed unsuccessfully in 0:00:00
make: *** [prepare] Error 1
Makefile:60: recipe for target 'prepare' failed
The command has failed after 5 attempts.

[calebcartwright]

@bors r+

[bors]

📌 Commit 3ac464f has been approved by calebcartwright

[bors]

⌛ Testing commit 3ac464f with merge 3419da8...

[bors]

☀️ Test successful - checks-actions
Approved by: calebcartwright
Pushing 3419da8 to master...

[rust-highfive]

📣 Toolstate changed by #81027!

Tested on commit 3419da8.
Direct link to PR: #81027

🎉 rls on windows: build-fail → test-pass (cc @Xanewok).
🎉 rls on linux: build-fail → test-pass (cc @Xanewok).

[Mark-Simulacrum]

Nominated and accepted for beta backport per #81093 (comment).