memblock: Add find_memory_core_early()
According to node range in early_node_map[] with __memblock_find_in_range to find free range. Will be used by memblock_x86_find_in_range_node() memblock_x86_find_in_range_node will be used to find right buffer for NODE_DATA Signed-off-by: NYinghai Lu <yinghai@kernel.org> Signed-off-by: NH. Peter Anvin <hpa@zytor.com>
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