Update Cargo

[alexcrichton]

Brings in some perf improvements!

[rust-highfive]

r? @nikomatsakis

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[petrochenkov]

Nice!
Running a single test with x.py test is annoyingly slow, maybe this will help a bit (submodule processing is still the main problem though).
For reference, the perf improvements in question are rust-lang/cargo#4118.
@bors r+

[bors]

📌 Commit c7bfa0c has been approved by petrochenkov

[Mark-Simulacrum]

@bors r-

https://travis-ci.org/rust-lang/rust/jobs/239646661#L1219

[00:01:38] error: the lock file needs to be updated but --frozen was passed to prevent this
[00:01:38] failed to run: /checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/cargo build --manifest-path /checkout/src/bootstrap/Cargo.toml --locked
[00:01:38] Build completed unsuccessfully in 0:00:31
[00:01:38] Makefile:76: recipe for target 'prepare' failed

[alexcrichton]

@bors: r+

FWIW I would not roll this up, it runs a high risk of breakage.

[bors]

📌 Commit 7bf9cf7 has been approved by alexcrichton

[ishitatsuyuki]

RLS submodule should also be updated since this changes API.

[bors]

⌛ Testing commit 7bf9cf7 with merge 3e7f190...

[bors]

💔 Test failed - status-travis

[alexcrichton]

@bors: r=petrochenkov

[bors]

📌 Commit 453080f has been approved by petrochenkov

[alexcrichton]

Nominating and accepting beta as the original beta didn't include this fix but we'll want to get the beta onto the rust-1.19.0 branch of Cargo.

[bors]

⌛ Testing commit 453080f with merge 03eb710...

[bors]

☀️ Test successful - status-appveyor, status-travis
Approved by: petrochenkov
Pushing 03eb710 to master...