Use JsonbIteratorToken consistently in automatic variable declarations.

Noah Misch <noah@leadboat.com>

Commit: f75c4fc1dc93d60246df324bf595912d557bcba6
Author: Noah Misch <noah@leadboat.com>
Date: 2015-10-12T14:10:51Z
Releases: 9.5.0
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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