re PR lto/45375 ([meta-bug] Issues with building Mozilla (i.e. Firefox) with LTO)

re PR lto/45375 ([meta-bug] Issues with building Mozilla (i.e. Firefox) with LTO)

	PR lto/45375
	* i386.c (gate): Check flag_expensive_optimizations and
	optimize_size.
	(ix86_option_override_internal): Drop optimize_size condition
	on MASK_ACCUMULATE_OUTGOING_ARGS, MASK_VZEROUPPER,
	MASK_AVX256_SPLIT_UNALIGNED_LOAD, MASK_AVX256_SPLIT_UNALIGNED_STORE,
	MASK_PREFER_AVX128.
	(ix86_avx256_split_vector_move_misalign,
	ix86_avx256_split_vector_move_misalign): Check optimize_insn_for_speed.
	* sse.md (all uses of TARGET_PREFER_AVX128): Add
	optimize_insn_for_speed_p check.

From-SVN: r219871