SuccessChanges

Summary

  1. Added XToolchainBuilder to build cross toolchains. (details)
Commit 12af0349225ae16ce1aa69d67dbea2fd1416bce8 by aorlov
Added XToolchainBuilder to build cross toolchains.
The factory provides build steps to build host-side tools and then
cross-build target libraries.
Only host-side tests are executed yet. The factory will be later
expanded to also run remote tests.
Differential Revision: https://reviews.llvm.org/D70039
The file was addedzorg/buildbot/builders/XToolchainBuilder.py