benchmark: refactor to eliminate redeclared vars
Backport for v4.x
Pull Request check-list
-
Does make -j8 test
(UNIX) orvcbuild test nosign
(Windows) pass with this change (including linting)? -
Is the commit message formatted according to [CONTRIBUTING.md][0]? -
If this change fixes a bug (or a performance problem), is a regression test (or a benchmark) included? -
Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
Affected core subsystem(s)
benchmark
Description of change
In order to comply with linting rules used in the rest of the code base,
eliminate redeclared variables. A conservative approach is used so as to
avoid unintentional performance issues (for example, as might be seen in
some situations when using let
instead of var
).