Integrate benchmarks and differential tests against an EVM interpreter (#7)

crates/benchmarks/src/lib.rs

@@ -0,0 +1,24 @@
+use polkavm::{BackendKind, Config, Engine, ExportIndex, Instance, SandboxKind};
+use revive_integration::mock_runtime;
+use revive_integration::mock_runtime::State;
+
+pub fn prepare_pvm(
+    code: &[u8],
+    input: &[u8],
+    backend: BackendKind,
+) -> (State, Instance<State>, ExportIndex) {
+    let mut config = Config::new();
+    config.set_backend(Some(backend));
+    config.set_sandbox(Some(SandboxKind::Linux));
+
+    let (instance, export_index) = mock_runtime::prepare(code, Some(config));
+
+    (State::new(input.to_vec()), instance, export_index)
+}
+
+pub fn instantiate_engine(backend: BackendKind) -> Engine {
+    let mut config = Config::new();
+    config.set_backend(Some(backend));
+    config.set_sandbox(Some(SandboxKind::Linux));
+    mock_runtime::setup(Some(config))
+}