94875aea7e
This fixes a rematerializer issue wherein re-creating the interval of a non-rematerializable super-register defined over multiple MIs, some of which defining entirely dead sub-registers, could cause a crash when changing the order of sub-definitions (for example during scheduling) because the re-created interval could end up with multiple connected components, which is illegal. The solution is to split separate components of the interval in such cases. The added unit test crashes without that added behavior.
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