Unaligned access trade-offs for SFrame FRE layout

[Sterling Augustine]

Agreed with the others that optimizing for size is preferred, but that it
would be very nice to know just how much performance we are talking about.

I wonder if a partial solution would be enough to alleviate the concerns.

Some of the unaligned accesses can be fixed without a change to the
specification at all. An implementation could align just the first
sframe_row_entry for every function. That first entry is accessed every
time a function is unwound, so this idea reduces the number of unaligned
accesses by about one per frame.

Not sure what the size penalty would be, but probably quite a bit less than
22%.
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