Remove ssememalign

Remove ssememalign

From INSTRUCTION EXCEPTION SPECIFICATION section in Intel software
developer manual volume 2, only legacy SSE instructions with memory
operand not 16-byte aligned get General Protection fault.  There is
no need to check 1, 2, 4, 8 byte alignments.  Since x86 backend has
accurate constraints and predicates for 16-byte alignment, we can
remove alignment check in ix86_legitimate_combined_insn.

	* config/i386/i386.c (ix86_legitimate_combined_insn): Remove
	alignment check.
	* config/i386/i386.md (ssememalign): Removed.
	* config/i386/sse.md: Remove ssememalign attribute from patterns.

From-SVN: r235224