[Patch, AArch64, 1/5] backport recent fixes to 2.23 - add missing alignment check

[Yufeng Zhang]

This patch adds missing alignment check to load/store uimm12 immediate 
offset.  It was committed to the trunk at:

http://sourceware.org/ml/binutils-cvs/2012-10/msg00058.html

OK for 2_23-branch?

Thanks,
Yufeng

opcodes/

	* aarch64-opc.c (operand_general_constraint_met_p): Change to
	check the alignment of addr.offset.imm instead of that of
	shifter.amount for operand type AARCH64_OPND_ADDR_UIMM12.
		
gas/testsuite/
	
	* gas/aarch64/illegal-2.s: Add test case.
	* gas/aarch64/illegal-2.l: Likewise.
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