[FIX] deprecated const& version of benchmark::DoNotOptimize

[eseiler]

Resolves #2747

Change: https://github.com/google/benchmark/commit/53df805dc820d720734d6538032f6b73f31f13ba Example of fix: https://github.com/google/benchmark/commit/f15f332fd1ae10ae6d13d816af9bcf3b196974cc

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[codecov[bot]]

Codecov Report

Base: 98.18% // Head: 98.18% // No change to project coverage :thumbsup:

Coverage data is based on head (95ae38f) compared to base (a719fb0). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #3133 +/- ## ======================================= Coverage 98.18% 98.18% ======================================= Files 276 276 Lines 12292 12292 ======================================= Hits 12069 12069 Misses 223 223 ``` Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=seqan). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=seqan)

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[eseiler]

They explained it with

The compiler assume that a constant reference, even though escaped via asm
volatile, is unchanged.  The const-ref interface is deprecated to discourage
new uses of it, as subtle compiler optimizations (invariant hoisting, etc.) can
occur.