[m-dev.] 4 tag bits

[Zoltan Somogyi]

I forgot one crucial place: boehm gc itself must be told the set of offsets we may use. It must know that an object it allocated at address n must be kept alive by a word valued at n+k where k is between 0 and 7, or now 15 (or more, per my previous email).

Note that this may reduce performance in both time and space
by reducing the effectiveness of gc.

Zoltan.
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