Get rid of last few vestiges of parsetree dependency on grammar token

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

Commit: c5ba16a83c808837995ca4520ce04f06cab531a4
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2003-02-10T04:44:47Z
Releases: 7.4.1
Get rid of last few vestiges of parsetree dependency on grammar token
codes, per discussion from last March.  parse.h should now be included
*only* by gram.y, scan.l, keywords.c, parser.c.  This prevents surprising
misbehavior after seemingly-trivial grammar adjustments.

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