tcg/aarch64: implement ldst 12bit scaled uimm offset
implement the 12bit scaled unsigned immediate offset variant of LDR/STR. This improves code size by avoiding the movi + ldst_r for naturally aligned offsets in range. Signed-off-by: NClaudio Fontana <claudio.fontana@huawei.com> Reviewed-by: NRichard Henderson <rth@twiddle.net>
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