fix: dont optimize out benches #188

Job	Run time
cmake-integration-tests (instrumentation, ubuntu-latest)	2m 2s
cmake-integration-tests (off, ubuntu-latest)	45s
bazel-integration-tests (instrumentation, ubuntu-latest)	1m 7s
bazel-integration-tests (walltime, codspeed-macro)	1m 17s
bazel-integration-tests (off, ubuntu-latest)	19s
windows-cmake-build (off)	1m 44s
cmake-integration-tests (walltime, codspeed-macro)	1m 57s
tests	13s
windows-cmake-build (walltime)	1m 56s
windows-bazel-build (off)	1m 21s
windows-bazel-build (walltime)	53s
	13m 34s

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