Move pg_dump memory routines into pg_dumpmem.c/h and restore common.c

Bruce Momjian <bruce@momjian.us>

Commit: 9a7d49d1fba666c8bfb9df0065545e85d54dbc41
Author: Bruce Momjian <bruce@momjian.us>
Date: 2011-11-27T03:34:36Z
Releases: 9.2.0
Move pg_dump memory routines into pg_dumpmem.c/h and restore common.c
with its original functions.  The previous function migration would
cause too many difficulties in back-patching.

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