std: Use rustc_demangle from crates.io

[alexcrichton]

No more need to duplicate the demangling routine between crates.io and
the standard library, we can use the exact same one!

[rust-highfive]

r? @nikomatsakis

(rust_highfive has picked a reviewer for you, use r? to override)

[Mark-Simulacrum]

@bors r+

Cc @michaelwoerister

[bors]

📌 Commit 8e6bc7f21fc9c7ba7f74573356892feda7b967f4 has been approved by Mark-Simulacrum

[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:00072961:start=1544827286430631660,finish=1544827287516367563,duration=1085735903
$ 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
---
[00:03:05] * compiler_builtins 
[00:03:05] some tidy checks failed
[00:03:05] 
[00:03:05] 
[00:03:05] 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" "--quiet"
[00:03:05] 
[00:03:05] 
[00:03:05] failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test src/tools/tidy
[00:03:05] Build completed unsuccessfully in 0:00:44
[00:03:05] Build completed unsuccessfully in 0:00:44
[00:03:05] Makefile:79: recipe for target 'tidy' failed
[00:03:05] make: *** [tidy] Error 1
The command "stamp sh -x -c "$RUN_SCRIPT"" exited with 2.
travis_time:start:09c6c786
$ date && (curl -fs --head https://google.com | grep ^Date: | sed 's/Date: //g' || true)
Fri Dec 14 22:44:41 UTC 2018
---
travis_time:end:0c3b76ec:start=1544827481835432244,finish=1544827481839939468,duration=4507224
travis_fold:end:after_failure.3
travis_fold:start:after_failure.4
travis_time:start:14312fe0
$ ln -s . checkout && for CORE in obj/cores/core.*; do EXE=$(echo $CORE | sed 's|obj/cores/core\.[0-9]*\.!checkout!\(.*\)|\1|;y|!|/|'); if [ -f "$EXE" ]; then printf travis_fold":start:crashlog\n\033[31;1m%s\033[0m\n" "$CORE"; gdb --batch -q -c "$CORE" "$EXE" -iex 'set auto-load off' -iex 'dir src/' -iex 'set sysroot .' -ex bt -ex q; echo travis_fold":"end:crashlog; fi; done || true
travis_fold:end:after_failure.4
travis_fold:start:after_failure.5
travis_time:start:07415a10
travis_time:start:07415a10
$ cat ./obj/build/x86_64-unknown-linux-gnu/native/asan/build/lib/asan/clang_rt.asan-dynamic-i386.vers || true
cat: ./obj/build/x86_64-unknown-linux-gnu/native/asan/build/lib/asan/clang_rt.asan-dynamic-i386.vers: No such file or directory
travis_fold:end:after_failure.5
travis_fold:start:after_failure.6
travis_time:start:0b240df8
$ dmesg | grep -i kill

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)

[alexcrichton]

@bors: r=Mark-Simulacrum

[bors]

📌 Commit fcc8bb4 has been approved by Mark-Simulacrum

[michaelwoerister]

Nice!