Otherwise, GCC < 7 does not link in the dialect registration, fails to look up
the dialect in the context and cannot construct SDBM objects.
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PiperOrigin-RevId: 249259758
We now have sufficient extensibility in dialects to move attribute components
such as SDBM out of the core IR into a dedicated dialect and make them
optional. Introduce an SDBM dialect and move the code. This is a mostly
non-functional change.
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PiperOrigin-RevId: 249244802