Use JsonbIteratorToken consistently in automatic variable declarations.

Noah Misch <noah@leadboat.com>

Commit: 7732d49ca211571552bf82b5207deed95c0cc09c
Author: Noah Misch <noah@leadboat.com>
Date: 2015-10-12T03:53:35Z
Releases: 9.6.0
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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