armv7m: Check exception return consistency
Implement the exception return consistency checks described in the v7M pseudocode ExceptionReturn(). Inspired by a patch from Michael Davidsaver's series, but this is a reimplementation from scratch based on the ARM ARM pseudocode. Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Reviewed-by: NAlex Bennée <alex.bennee@linaro.org>
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