Some of these functions are invoked by BytecodeGenerator due to parser
desugarings, and moving the context indices cause
BytecodeExpectationsPrinter to render them as something
useful/meaningful.

BUG=
R=jgruber@chromium.org, adamk@chromium.org

Review-Url: https://codereview.chromium.org/2695323002
Cr-Commit-Position: refs/heads/master@{#43225}