Generate acqrel atomic.fence in fuzzer#8885
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Fixes #8770. The fuzzer was non-deterministic across architectures since we had two calls to `pick()` in the arguments to `makeAtomicRMW`, so the evaluation order of the two `pick` calls was non-deterministic. Fix this by pulling the function calls outside of the arguments of `makeAtomicRMW`. Also increase the fuzz metrics test seed file size (2214 bytes -> 1020 KB) to increase the likelihood of catching similar issues in CI, and exercise more instructions in the test. This bug wasn't caught by CI in #8253. Tested by basing #8885 on top of this which failed previously due to the non-determinism, and now succeeds.
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Part of #8165.