Fix -Zdump-mir-dataflow by implementing DebugWithContext for ChunkedBitSet #96578
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DebugWithContext
is used to format changes to dataflow state along with MIRin graphviz dot files. In the case of
ChunkedBitSet
it was left unimplemented,so attempts to use
-Zdump-mir-dataflow -Zdump-mir=all
resulted in an ICE:Provide the missing implementation.
r? @nnethercote