* unwind-dw2.h (_Unwind_FrameState): Add REG_UNDEFINED enum value.

	* unwind-dw2.h (_Unwind_FrameState): Add REG_UNDEFINED enum value.
	* unwind-dw2.c (execute_cfa_program): Set how to REG_UNDEFINED
	instead of REG_UNSAVED for DW_CFA_undefined.
	(uw_update_context_1): Handle REG_UNDEFINED the same as REG_UNSAVED.
	(uw_update_context): If RA column is REG_UNDEFINED, mark it as
	outermost frame.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@145535 138bc75d-0d04-0410-961f-82ee72b054a4