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Fixed malloc() and free() causing system crashes when accessing PageBitmap #20

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using malloc() or free() and then accessing PageBitmap from the GlobalAllocator would sometimes cause system crashes. moving the function declaration inside of PageFrameAllocator.cpp fixes this issue. This could be a bug only on my system would like to know if it happens elsewhere.

…itmap

using malloc() or free() and then accessing PageBitmap from the GlobalAllocator would sometimes cause system crashes. moving the function declaration inside of PageFrameAllocator.cpp fixes this issue.
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