Change ginMergeItemPointers to return a palloc'd array.

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: bb42e21be274a71f6868ce2fc8fae2c15c3ecf66
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2014-03-24T16:44:40Z
Releases: 9.4.0
Change ginMergeItemPointers to return a palloc'd array.

That seems nicer than making it the caller's responsibility to pass a
suitable-sized array. All the callers were just palloc'ing an array anyway.

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