i386.md (UNSPEC_SSE_PROLOGUE_SAVE_LOW): New.

	* i386.md (UNSPEC_SSE_PROLOGUE_SAVE_LOW): New.
	(sse_prologue_save_insn expander): Use new pattern.
	(sse_prologue_save_insn1): New pattern and splitter.
	(sse_prologue_save_insn): Update to deal also with 64bit aligned
	blocks.
	* i386.c (setup_incoming_varargs_64): Do not compute jump destination here.
	(ix86_gimplify_va_arg): Update alignment needed.
	(ix86_local_alignment): Do not align all local arrays
	to 128bit.

From-SVN: r158483