Remove some unnecessary feature gates

[oli-obk]

fixes #56585

cc @jethrogb

[rust-highfive]

r? @alexcrichton

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[jethrogb]

Mostly LGTM

For the 2 functions you removed, can you put #[allow(unused)] or #[cfg(false)] instead?

[rust-highfive]

The job x86_64-gnu-llvm-5.0 of your PR failed on Travis (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.

travis_time:end:1d63d400:start=1544520950345851071,finish=1544520951421633700,duration=1075782629
$ git checkout -qf FETCH_HEAD
travis_fold:end:git.checkout

Encrypted environment variables have been removed for security reasons.
See https://docs.travis-ci.com/user/pull-requests/#Pull-Requests-and-Security-Restrictions
$ export SCCACHE_BUCKET=rust-lang-ci-sccache2
$ export SCCACHE_REGION=us-west-1
Setting environment variables from .travis.yml
$ export IMAGE=x86_64-gnu-llvm-5.0
---
[00:04:12] command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/cargo" "build" "--target" "x86_64-unknown-linux-gnu" "-j" "4" "--release" "--locked" "--color" "always" "--features" "panic-unwind backtrace" "--manifest-path" "/checkout/src/libstd/Cargo.toml" "--message-format" "json"
[00:04:12] expected success, got: exit code: 101
[00:04:12] failed to run: /checkout/obj/build/bootstrap/debug/bootstrap build
[00:04:12] Build completed unsuccessfully in 0:00:50
[00:04:12] Makefile:28: recipe for target 'all' failed
[00:04:12] make: *** [all] Error 1

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)

[oli-obk]

For the 2 functions you removed, can you put #[allow(unused)] or #[cfg(false)] instead?

Any particular reason? Can't you just git revert 1346619 when you need them?

[jethrogb]

Oh I didn't see it was a separate commit. Sure, that works.

[alexcrichton]

@bors: r+

[bors]

📌 Commit 5457b19 has been approved by alexcrichton