Use JsonbIteratorToken consistently in automatic variable declarations.

Noah Misch <noah@leadboat.com>

Commit: 22c5705f81717dd0622ebfb13a617e6104d1fbd9
Author: Noah Misch <noah@leadboat.com>
Date: 2015-10-12T14:12:44Z
Releases: 9.4.6
Use JsonbIteratorToken consistently in automatic variable declarations.

Many functions stored JsonbIteratorToken values in variables of other
integer types.  Also, standardize order relative to other declarations.
Expect compilers to generate the same code before and after this change.

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