Added size of sequence points to mono jit stats.
SeqPoint next array is no longer allocated by default.
Next array will only be allocated if has_debug_data is true.
Merged SeqPoint.next_array with SeqPoint.array.
MonoSeqPointInfo no longer uses a GByteArray.
GByteArray requires too much memory, we still use GByteArray to build the buffer but when its done we store in MonoSeqPointInfo a copy.
MonoSeqPointInfo data is now compressed.
Encode data MonoSeqPointInfo len, has_debug_data and alloc_data into a single variable int.