This fixes the long standing bug with strict aliasing that caused heavily JITed code to miscompile. It stemmed first from pointer reinterpretation which is simply undefined behavior. After fixing that with an `union` and `ffi.copy`, the issue manifested in a different way. Further debugging showed that it was likely that `ffi.copy` (and `ffi.C.memcpy`) would still alias pointers through coercion, more undefined behavior. Now, memory is handled with an `Any` type instead, so aliasing does not occur although unaligned reads and writes may be a problem in the future. I hope this doesn't break. It was very painful to debug.
