fix: dont optimize out benches #178

Job	Run time
cmake-integration-tests (off, ubuntu-latest)	1m 1s
windows-cmake-build (walltime)	1m 55s
windows-cmake-build (off)	2m 15s
bazel-integration-tests (instrumentation, ubuntu-latest)	1m 0s
bazel-integration-tests (off, ubuntu-latest)	31s
bazel-integration-tests (walltime, codspeed-macro)	1m 11s
windows-bazel-build (off)	2m 11s
tests	17s
cmake-integration-tests (walltime, codspeed-macro)	2m 7s
windows-bazel-build (walltime)	1m 43s
cmake-integration-tests (instrumentation, ubuntu-latest)	2m 13s
	16m 24s

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