target/arm: Introduce ARM_FEATURE_V8_ATOMICS and initial decode
The insns in the ARMv8.1-Atomics are added to the existing load/store exclusive and load/store reg opcode spaces. Rearrange the top-level decoders for these to accomodate. The Atomics insns themselves still generate Unallocated. Signed-off-by: NRichard Henderson <richard.henderson@linaro.org> Message-id: 20180508151437.4232-8-richard.henderson@linaro.org [PMM: Drop the ARM_FEATURE_V8_1 feature flag] Reviewed-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
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