target-arm: Fix CP15 based WFI
The coprocessor register rework broke cp15 based WFI instructions. We incorrectly fall through the normal register write case, which incorrectly adds a forced block termination. We've already done a special version of this (DISAS_WFI), so return immediately. Signed-off-by: NPaul Brook <paul@codesourcery.com> Reviewed-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
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