Optimize memory use of AttributeContainer:

- Relatively few locations are set relative to the number of attributes.
  Replace the sparse array with a dense one.
- BitSet requires a minimum of two objects (48 bytes in our current JVM),
  but we set an average of just six bits.  Replace it with a list of
  indices packed into a byte[], shared with the locations array.

Also add some assertions to help the next reader.

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MOS_MIGRATED_REVID=124830576

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