[m-dev.] using set_tree234 as the default implementation of sets

[Zoltan Somogyi]

I tried this, and on tools/speedtest, it led to a 6% slowdown when the compiler
was compiled in hlc.gc, and a 14% slowdown when the compiler was compiled in
asm_fast.gc. These results tell me we should continue to use set_tree234
in places where sets can become very big, but we should continue to use
plain sets in places where they are very unlikely to become big, which in
the compiler is most places.

Zoltan.
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