tcg: Simplify logic using TCG_OPF_NOT_PRESENT
Expand the definition of "not present" to include "should not be present". This means we can simplify the logic surrounding the generic tcg opcodes for which the host backend ought not be providing definitions. Reviewed-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NRichard Henderson <rth@twiddle.net>
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