Expand Cacheline Size Detection Logic

[insertinterestingnamehere]

We have some initial logic for detecting the cache line size using cpuid, but it doesn't really apply cleanly to the modern architectures that we care about now. It should be expanded.

[insertinterestingnamehere]

Note, this is also a problem we have at build time for determining the size of certain data structures. If possible I'd like to at least get something semi-reasonable figured out for the build-time issue by the next release.