* config/i386/cygwin.asm: Include auto-host.h.
	(cfi_startproc, cfi_endproc, cfi_adjust_cfa_offset,
	cfi_def_cfa_register, cfi_register, cfi_push, cfi_pop): New macros.
	(__chkstk, __alloca): Annotate for dwarf2 unwind info.  Drop
	alignment code from the 64-bit path.  Use gas local labels.
	* config/i386/i386.md (pro_epilogue_adjust_stack_<mode>_2): Macroize
	from _di_2.  Remove the useless constant integer argument.
	(pro_epilogue_adjust_stack_<mode>_3): New.
	(allocate_stack_worker_probe_<mode>): Macroize from
	allocate_stack_worker_{32,64}.  Use __chkstk_ms.  Update all users.
	* config/i386/i386.c (ix86_expand_prologue): Use __chkstk_ms;
	use gen_pro_epilogue_adjust_stack_*_3 and annotate it.
	(__chkstk_ms): New function.
	* config/i386/t-cygming (LIB1ASMFUNCS): Add _chkstk_ms.
	* gcc/config/i386/t-interix: Likewise.
	* configure.ac (HAVE_GAS_CFI_DIRECTIVE): Export for target.
	(HAVE_GAS_CFI_PERSONALITY_DIRECTIVE): Likewise.
	(HAVE_GAS_CFI_SECTIONS_DIRECTIVE): Likewise.
	* configure, config.in: Rebuild.

Co-Authored-By: Richard Henderson <rth@redhat.com>

From-SVN: r164628