PR29250, readelf erases CIE initial register state

PR29250, readelf erases CIE initial register state

	PR 29250
binutils/
	* dwarf.c (display_debug_frames): Set col_type[reg] on sizing
	pass over FDE to cie->col_type[reg] if CIE specifies reg.
	Handle DW_CFA_restore and DW_CFA_restore_extended on second
	pass using the same logic.  Remove unnecessary casts.  Don't
	call frame_need_space on second pass over FDE.
gas/
	* testsuite/gas/i386/ehinterp.d,
	* testsuite/gas/i386/ehinterp.s: New test.
	* testsuite/gas/i386/i386.exp: Run it.