* cfgcleanup.c (try_crossjump_to_edge): Only skip past
	NOTE_INSN_BASIC_BLOCK.
	* cfglayout.c (duplicate_insn_chain): Copy epilogue insn marks.
	Duplicate NOTE_INSN_EPILOGUE_BEG notes.
	* cfgrtl.c (can_delete_note_p): Allow NOTE_INSN_EPILOGUE_BEG
	to be deleted.
	* dwarf2out.c (struct cfa_loc): Change indirect field to bitfield,
	add in_use field.
	(add_cfi): Disable check redefining cfa away from drap.
	(lookup_cfa_1): Add remember argument; handle remember/restore.
	(lookup_cfa): Pass remember argument.
	(cfa_remember): New.
	(compute_barrier_args_size_1): Remove sibcall check.
	(dwarf2out_frame_debug_def_cfa): New.
	(dwarf2out_frame_debug_adjust_cfa): New.
	(dwarf2out_frame_debug_cfa_offset): New.
	(dwarf2out_frame_debug_cfa_register): New.
	(dwarf2out_frame_debug_cfa_restore): New.
	(dwarf2out_frame_debug): Handle REG_CFA_* notes.
	(dwarf2out_begin_epilogue): New.
	(dwarf2out_frame_debug_restore_state): New.
	(dw_cfi_oprnd1_desc): Handle DW_CFA_remember_state,
	DW_CFA_restore_state.
	(output_cfi_directive): Likewise.
	(convert_cfa_to_fb_loc_list): Likewise.
	(dw_cfi_oprnd1_desc): Handle DW_CFA_restore.
	* dwarf2out.h: Update.
	* emit-rtl.c (try_split): Don't split RTX_FRAME_RELATED_P.
	(copy_insn_1): Early out for null.
	* final.c (final_scan_insn): Call dwarf2out_begin_epilogue
	and dwarf2out_frame_debug_restore_state.
	* function.c (prologue, epilogue, sibcall_epilogue): Remove.
	(prologue_insn_hash, epilogue_insn_hash): New.
	(free_after_compilation): Adjust freeing accordingly.
	(record_insns): Create hash table if needed; push insns into
	hash instead of array.
	(maybe_copy_epilogue_insn): New.
	(contains): Search hash table instead of array.
	(sibcall_epilogue_contains): Remove.
	(thread_prologue_and_epilogue_insns): Split eh_return insns
	and mark them as epilogues.
	(reposition_prologue_and_epilogue_notes): Rewrite epilogue
	scanning in terms of basic blocks.
	* insn-notes.def (CFA_RESTORE_STATE): New.
	* jump.c (returnjump_p_1): Accept EH_RETURN.
	(eh_returnjump_p_1, eh_returnjump_p): New.
	* reg-notes.def (CFA_DEF_CFA, CFA_ADJUST_CFA, CFA_OFFSET,
	CFA_REGISTER, CFA_RESTORE): New.
	* rtl.def (EH_RETURN): New.
	* rtl.h (eh_returnjump_p, maybe_copy_epilogue_insn): Declare.

	* config/bfin/bfin.md (UNSPEC_VOLATILE_EH_RETURN): Remove.
	(eh_return_internal): Use eh_return rtx; split w/ epilogue.

	* config/i386/i386.c (gen_push): Update cfa state.
	(pro_epilogue_adjust_stack): Add set_cfa argument.  When true,
	add a CFA_ADJUST_CFA note.
	(ix86_dwarf_handle_frame_unspec): Remove.
	(ix86_expand_prologue): Update cfa state.
	(ix86_emit_restore_reg_using_pop): New.
	(ix86_emit_restore_regs_using_pop): New.
	(ix86_emit_leave): New.
	(ix86_emit_restore_regs_using_mov): Add CFA_RESTORE notes.
	(ix86_expand_epilogue): Add notes for unwinding the epilogue.
	* config/i386/i386.h (struct machine_cfa_state): New.
	(ix86_cfa_state): New.
	* config/i386/i386.md (UNSPEC_EH_RETURN): Remove.
	(eh_return_internal): Merge from eh_return_<mode>,
	use eh_return rtx, split w/ epilogue.

From-SVN: r147995