Merge binding resolution/flattening/indexing

[yjbanov]

As per comment #1286 (comment) we could reduce the number of intermediate data structures if we resolved, flattened and indexed the bindings in a single pass.

Note: this is low priority because this code is not (currently) performance-critical.

[mhevery]

Obsolete with @tbosch #3605 Closing.

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