[dmd-internals] Enabling precise GCs

[Leandro Lucarella]

Hi, Walter, I don't know if you has been keeping an eye on bug 3463[1],
but I would like very much to know if you are interested on integrating
the patch to the compiler. It has suffered a few iterations and the
current one seems good enough, and it's backwards compatible (you can
compile a runtime, Tango or Phobos, that doesn't know anything about
precise scanning using a precise-enabled compiler and all works just
fine, which makes it a good candidate for D1 too).

I really don't care too much about the runtime patches right now, but
I find the compiler patch quite important, as it enables a new field in
GC research for D, with this patch it is possible to experiment even
with moving collectors.

What do you think?

[1] http://d.puremagic.com/issues/show_bug.cgi?id=3463

-- 
Leandro Lucarella (AKA luca)                     http://llucax.com.ar/
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