Merge parser's p_relnamespace and p_varnamespace lists into a single list.

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

Commit: f630157496a70f8ece4fd4c27eeead88c74b9015
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2012-08-08T20:41:31Z
Releases: 9.3.0
Merge parser's p_relnamespace and p_varnamespace lists into a single list.

Now that we are storing structs in these lists, the distinction between
the two lists can be represented with a couple of extra flags while using
only a single list.  This simplifies the code and should save a little
bit of palloc traffic, since the majority of RTEs are represented in both
lists anyway.

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