re PR target/42448 (Wrong code with _Complex char in structure)

	PR target/42448
	* config/alpha/predicates.md (aligned_memory_operand): Return false
	for CQImode.
	(unaligned_memory_operand): Return true for CQImode.
	* config/alpha/alpha.c (get_aligned_mem): Assert that location
	doesn not cross aligned SImode word boundary.

testsuite/ChangeLog:

	PR target/42448
	* gcc.target/alpha/pr42448-1.c: New test.
	* gcc.target/alpha/pr42448-2.c: Ditto.

From-SVN: r155566