Currently, we have two different lists of features each CPU supports... and those lists aren't consistent. This patch assumes AArch64.td is right, and tries to fix AArch64TargetParser to match.
That said... I really have no idea which feature list is actually right. I don't have these CPUs, and I can't find documentation. So I'd appreciate input on whether my "corrections" are actually correct.
Probably we should try to unify the two lists at some point, but synchronizing them seems like a prerequisite to that anyway.
Adds +spe. The processor supports it.