fix: dont optimize out benches #189

Job	Run time
tests	14s
cmake-integration-tests (instrumentation, ubuntu-latest)	1m 18s
windows-bazel-build (walltime)	1m 22s
cmake-integration-tests (walltime, codspeed-macro)	1m 57s
cmake-integration-tests (off, ubuntu-latest)	1m 1s
bazel-integration-tests (walltime, codspeed-macro)	1m 18s
windows-cmake-build (walltime)	1m 52s
bazel-integration-tests (instrumentation, ubuntu-latest)	1m 7s
windows-bazel-build (off)	1m 10s
windows-cmake-build (off)	1m 44s
bazel-integration-tests (off, ubuntu-latest)	24s
	13m 27s

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