Commit ab92184ff8f1 ("erofs: add on-disk compressed tail-packing inline
support") introduced the flag `Z_EROFS_ADVISE_INLINE_PCLUSTER`, which is
redundant because `h_idata_size != 0` serves the same purpose.
Additionally, merge `z_idataoff` and `z_fragmentoff` since these two
features are mutually exclusive for a given inode.
Signed-off-by: Gao Xiang <hsiangkao@xxxxxxxxxxxxxxxxx>
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new patch.