[cPerf] LNT error on LLD bot

[Renato Golin via llvm-commits]

Hi Kristof,

I think this one is yours. :)

http://lab.llvm.org:8011/builders/clang-cmake-aarch64-lld/builds/1094/steps/setup%20lit/logs/stdio

First, we got errors that GCC is not installed (we use Clang), now it
has some cc1 errors. I wonder why this is now a requirement and why it
started failing after your patch, since you haven't added anything
new...

cheers,
--renato