Remove a couple of unnecessary calls of CreateCacheMemoryContext. These

Tom Lane <tgl@sss.pgh.pa.us>

Commit: d4d1885e42ecc7d61c045f6d53b8fef4454083a9
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2009-12-27T18:55:52Z
Releases: 9.0.0
Remove a couple of unnecessary calls of CreateCacheMemoryContext.  These
probably got there via blind copy-and-paste from one of the legitimate
callers, so rearrange and comment that code a bit to make it clearer that
this isn't a necessary prerequisite to hash_create.  Per observation
from Robert Haas.

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