Have primitiveNextObject fail in Spur. DTL's recent Kernel changes are good, but it's still preferrable for the primtiive to check since performance isn't an issue in Spur (we use allObjects).
Have the code generator eliminate redundant assignments (aVar = aVar) which tend to be generated from Smalltalk idioms where a variable is assigned from a method taking it as a parameter that in some circumstances is a noop, e.g. assignment to latestContinuation from maybeDealWithUnsafeJumpForDescriptor:pc:latestContinuation:. This to reduce C compiler warnings.
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