linux.h (IA64_GATE_AREA_END): Increase by 64K.

linux.h (IA64_GATE_AREA_END): Increase by 64K.

	* config/ia64/linux.h (IA64_GATE_AREA_END): Increase by 64K.
	(MD_FALLBACK_FRAME_STATE_FOR): Set fpsr_loc, br_loc[6] and
	br_loc[7].  Update comment.
	(MD_HANDLE_UNWABI): Define.
	* config/ia64/unwind-ia64.c (struct unw_state_record): Add
	unwabi field.
	(struct _Unwind_Context): Increase br_loc array size to 8 entries.
	(desc_abi): Set unwabi.
	(uw_update_reg_address): Allow br up to 7.
	(uw_update_context): Invoke MD_HANDLE_UNWABI if defined.
	(uw_install_context): Load b1..b5 from correct locations.
	Fix insn loading ar.fpsr.
	* doc/tm.texi: Document MD_HANDLE_UNWABI.

	* g++.dg/eh/ia64-1.C: New test.

From-SVN: r74575