2017-08-08  Daniel Santos  <daniel.santos@pobox.com>

	* config/i386/i386.h (ix86_frame::stack_realign_allocate_offset):
	Remove
	(ix86_frame::stack_realign_allocate): New field.
	(struct machine_frame_state): Modify comments.
	(machine_frame_state::sp_realigned_fp_end): New field.
	* config/i386/i386.c (ix86_compute_frame_layout): Modify.
	(sp_valid_at): Likewise.
	(fp_valid_at): Likewise.
	(choose_baseaddr): Modify comments.
	(ix86_emit_outlined_ms2sysv_save): Modify.
	(ix86_expand_prologue): Likewise.
	* doc/sourcebuild.texi (avx2, avx2_runtime): Add missing items to
	effective-targets.
	(avx512f, avx512f_runtime): Add new items to effective-tarets.