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UBsan dispatch only for fuzzing and sanitizer mode #128

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Sanitizers and fuzzers should enable the fuzzing mode. Without the fuzzing mode we can assume that the UBsan minimal run-time is used, and we don't want to enable it for dispatch, as it hampers the emulator too much. Thus, disable UBsan for dispatch when not sanitizing.

There is afaik no way to detect UBsan minimal run-time.

Sanitizers and fuzzers should enable the fuzzing mode. Without the fuzzing mode we can assume that the UBsan minimal run-time is used, and we don't want to enable it for dispatch, as it hampers the emulator too much. Thus, disable UBsan for dispatch when not sanitizing.
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