asac tipped me off that there are some tests that aren't automatically run, and with that, and his assistance on locating possible changesets to backport, I can claim I've successfully run TB2 on ARM and downloaded my inbox with it. Patch attached. I'm now creating a new branch with both this patch, and the other one. The stack corruption seen in fontconfig was actually an issue with the stack on ARM caused in xpinvoke.
asac tipped me off that there are some tests that aren't automatically run, and with that, and his assistance on locating possible changesets to backport, I can claim I've successfully run TB2 on ARM and downloaded my inbox with it. Patch attached. I'm now creating a new branch with both this patch, and the other one. The stack corruption seen in fontconfig was actually an issue with the stack on ARM caused in xpinvoke.