Mirror interpreter implementation:
- use builtins::must_cache to determine whether builtin must be cached.
- reuse cached value when applicable
- clear the VM’s builtin cache whenever execution state resets to avoid leaking values across runs
- add a YAML regression for rand.intn set comprehensions and re-enable the rand cases in the OPA test suite
Signed-off-by: Anand Krishnamoorthi <anakrish@microsoft.com>
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