To allow the VR team to test AArch64 builds on x64 hardware, and to enable jit-tests running on Simulator builds on x64 hardware for Treeherder, I am working on updating the copy of VIXL that we have in-tree. We haven't pulled from VIXL in years. This will be landed as one humongous patch, not requiring serious review (since it is mostly a dependency and not actually our code). I have been careful in preserving local changes that we've made to the previous version. I expect this should take slightly less than a week, if testing goes well. The hope is that the updated simulator version may help with some bugs.

This bug may be a duplicate of bug 1435968.