[PATCH 4/5]: Use pointer_map in tree-nested

[Paolo Bonzini]

Here, the data structure was uselessly allocated in GGC space (in fact 
it was ggc_free'd explicitly).  For simplicity I moved it to malloc 
space, even though a pool could also be a good idea.  I also moved the 
bitmap that were allocated by tree-nested into their own obstack so that 
all of them can be easily cleared in a single step.

Bootstrapped C/C++/Ada/Java (Fortran is broken) on i686-pc-linux-gnu, ok 
for mainline?

Paolo
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