swift

6bc0c9e8 - [NFC] Extracted emitPackExpansionElementMetadata.

[NFC] Extracted emitPackExpansionElementMetadata. The function emits the metadata for the element of a pack expansion at a specified index. It was previously defined inline in the loop--defined in emitPackExpansionType--which populates a new metadata array with elements derived from a preexisting array. It will be used to emit a single element in the case that only one is needed.