target-arm: implement WFE/YIELD as a yield for AArch64
Like was done for AArch32 for WFE, implement both WFE and YIELD as a yield operation. This speeds up multi-core system emulation. Signed-off-by: NRob Herring <rob.herring@linaro.org> Message-id: 1397588401-20366-1-git-send-email-robherring2@gmail.com Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
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