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Recursively collect identifier / property loads and optional chains from inner functions. This PR is in preparation for #31200 Previously, we only did this in `collectHoistablePropertyLoads` to understand hoistable property loads from inner functions. 1. collectTemporariesSidemap 2. collectOptionalChainSidemap 3. collectHoistablePropertyLoads - ^ this recursively calls `collectTemporariesSidemap`, `collectOptionalChainSidemap`, and `collectOptionalChainSidemap` on inner functions 4. collectDependencies Now, we have 1. collectTemporariesSidemap - recursively record identifiers in inner functions. Note that we track all temporaries in the same map as `IdentifierIds` are currently unique across functions 2. collectOptionalChainSidemap - recursively records optional chain sidemaps in inner functions 3. collectHoistablePropertyLoads - (unchanged, except to remove recursive collection of temporaries) 4. collectDependencies - unchanged: to be modified to recursively collect dependencies in next PR '