1.27.1 powerpc64/powerpc64le ui/target-feature-{gate,wrong} failing

[infinity0]

• Debian log https://buildd.debian.org/status/fetch.php?pkg=rustc&arch=ppc64el&ver=1.27.1%2Bdfsg1-1%7Eexp1&stamp=1531883902&raw=0
• Fedora log https://kojipkgs.fedoraproject.org//packages/rust/1.27.1/3.fc29/data/logs/ppc64le/build.log

Since the files already have // ignore-arm for now I will go ahead and add // ignore-powerpc64{,le} to the Debian patches.

However target-feature-gate.rs also has gate-test-powerpc_target_feature so I wonder if ignore-powerpc64 is the best approach.

[Enselic]

Triage: Is this still a problem? Wanted to check since 5 years have passed and circumstances might have changed.