[WIP] Use arenas to avoid Lrc in queries #3

[Zoxc]

Based on #59545.

r? @eddyb

[rust-highfive]

The job x86_64-gnu-llvm-6.0 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:04814a5d:start=1555147275867311234,finish=1555147277994247786,duration=2126936552
$ 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
$ export GCP_CACHE_BUCKET=rust-lang-ci-cache
$ export AWS_ACCESS_KEY_ID=AKIA46X5W6CZEJZ6XT55
---
travis_fold:end:after_failure.1
travis_fold:start:after_failure.2
travis_time:start:1222f66a
$ ls -lat $HOME/Library/Logs/DiagnosticReports/
ls: cannn/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:1ca58a96
$ 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)

[bors]

☔ The latest upstream changes (presumably #59949) made this pull request unmergeable. Please resolve the merge conflicts.

[Dylan-DPC-zz]

ping from triage @Zoxc you have failing tests and conflicts to resolve