re PR target/29166 (broken unwind information for many life variables resulting in register corruption)

	PR target/29166
	* config/ia64/ia64.c (ia64_compute_frame_size): Account space for
	save of BR0 in extra_spill_size instead of spill_size.
	(ia64_expand_prologue): Save BR0 outside of the gr/br/fr spill
	area.
	(ia64_expand_epilogue): Restore BR0 from its new location.

testsuite/:
	* g++.dg/eh/pr29166.C: New test.

From-SVN: r120319