Patch: Add new _Jv_SetGCFreeSpaceDivisor method to libgcj.

[David Daney]

As I mentioned previously, GC_free_space_divisor is no longer exported 
from libgcj.so.

Access to this GC tuning parameter is needed on systems where the 
maximum heap size is set.  If GC_free_space_divisor is not set to a 
value larger than its default value of three, the heap can easily get 
fragmented in such a manner that OutOfMemoryErrors are thrown even 
though there is plenty of free memory.

Since the loss of the ability to adjust GC_free_space_divisor is a 
regression, this should be committed even though we are in stage three.

Tested on x86_64-pc-linux-gnu in libjava with no regressions.

OK to commit?

2007-10-20  David Daney  <ddaney@avtrex.com>

    * include/jvm.h (_Jv_SetGCFreeSpaceDivisor): Declare new function.
    * boehm.cc (_Jv_SetGCFreeSpaceDivisor): Define it.

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