re PR target/25199 (crashing code output from -mtune=pentium4 but not -mtune=pentiumpro)

	PR target/25199
	* config/i386/i386.md (movqi_1): Only force imovx for alternative
	5 if operand 1 is not aligned.  Undo previous constraint change.
	* config/i386/predicates.md (aligned_operand): Use MEM_ALIGN.
testsuite/
	* gcc.target/i386/movq-2.c: New test.
	* gcc.target/i386/movq.c: Remove target i?86, instead add
	dg-require-effective-target ilp32.

From-SVN: r107955