Backport fix for Bug#8219 from trunk.
* buffer.h (BUF_BEGV, BUF_BEGV_BYTE, BUF_ZV, BUF_ZV_BYTE, BUF_PT) (BUF_PT_BYTE): Rewrite to handle indirect buffers (Bug#8219). These macros can no longer be used for assignment. * buffer.c (Fget_buffer_create, Fmake_indirect_buffer): Assign struct members directly, instead of using BUF_BEGV etc. (record_buffer_markers, fetch_buffer_markers): New functions for recording and fetching special buffer markers. (set_buffer_internal_1, set_buffer_temp): Use them. * lread.c (unreadchar): Use SET_BUF_PT_BOTH. * insdel.c (adjust_point): Use SET_BUF_PT_BOTH. * intervals.c (temp_set_point_both): Use SET_BUF_PT_BOTH. (get_local_map): Use SET_BUF_BEGV_BOTH and SET_BUF_ZV_BOTH. * xdisp.c (hscroll_window_tree): (reconsider_clip_changes): Use PT instead of BUF_PT.
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