* i386-protos.h (ix86_setup_incoming_varargs, ix86_va_arg,
	ix86_va_start, ix86_build_va_list): Declare.
	* i386.c (ix86_setup_incoming_varargs, ix86_va_arg,
	ix86_va_start, ix86_build_va_list): New global functions.
	* i386.md (sse_prologue_save_insn): New insn.
	(sse_prologue_save): New expander.
	* i386.h (EXPAND_BUILTIN_VA_ARG, EXPAND_BUILTIN_VA_START,
	BUILD_VA_LIST_TYPE, SETUP_INCOMING_VARARGS): New macros.

From-SVN: r45862