reserve heap area on Darwin

[emmanuel maillard]

Hi,

This patch reserve the heap area on Darwin.
Because, strangely, mmap return a lower address when we try to mmap at 
0x80000000
we check the availabilty of the heap area (using vm_region) and if the 
area is totally free
we use MAP_FIXED to reserve it.

  thanks

emmanuel

Changelog :
	Reserve Heap area on Darwin


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