perf(bench): prevent constant-folding of fib input across iterations #501

Job	Run time
toolchain-detection-tests	4s
tests	28s
macos-walltime-bazel-test	6m 29s
macos-walltime-cmake-test	7m 11s
cmake-build (ubuntu-latest, off)	1m 12s
bazel-integration-tests (off, ubuntu-latest)	32s
lint	26s
bazel-integration-tests (memory, ubuntu-latest)	2m 3s
cmake-build (ubuntu-latest, walltime)	1m 3s
cmake-build (windows-latest, walltime)	2m 56s
cmake-integration-tests (memory, ubuntu-latest)	1m 21s
bazel-integration-tests (simulation, ubuntu-latest)	1m 24s
bazel-integration-tests (walltime, codspeed-macro)	7m 29s
cmake-integration-tests (simulation, ubuntu-latest)	1m 44s
cmake-build (windows-latest, off)	2m 19s
bazel-build (ubuntu-latest, walltime, 9.0.0-pre.20250921.2)	1m 45s
cmake-integration-tests (walltime, codspeed-macro)	7m 42s
bazel-build (windows-latest, off, 8.4.2)	1m 55s
bazel-build (ubuntu-latest, walltime, 7.6.2)	38s
bazel-build (windows-latest, off, 9.0.0-pre.20250921.2)	1m 48s
bazel-build (ubuntu-latest, off, 7.6.2)	35s
bazel-build (windows-latest, off, 7.6.2)	2m 48s
cmake-integration-tests (off, ubuntu-latest)	1m 8s
bazel-build (ubuntu-latest, off, 8.4.2)	34s
bazel-build (ubuntu-latest, off, 9.0.0-pre.20250921.2)	44s
bazel-build (windows-latest, walltime, 7.6.2)	2m 11s
bazel-build (windows-latest, walltime, 8.4.2)	2m 33s
bazel-build (ubuntu-latest, walltime, 8.4.2)	32s
bazel-build (windows-latest, walltime, 9.0.0-pre.20250921.2)	1m 37s
	1h 3m 11s

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