Review fixes

Signed-off-by: Dmitry Murzin <diralik@yandex.ru>

crates/iroha_core/src/executor.rs

@@ -142,14 +142,14 @@ impl Executor {
             }
             Self::UserProvided(loaded_executor) => {
                 let wasm_cache = WasmCache::change_lifetime(wasm_cache);
-                let mut runtime =
-                    wasm_cache.create_runtime_cached(state_transaction, &loaded_executor.module)?;
+                let mut runtime = wasm_cache
+                    .take_or_create_cached_runtime(state_transaction, &loaded_executor.module)?;
                 let result = runtime.execute_executor_validate_transaction(
                     state_transaction,
                     authority,
                     transaction,
                 )?;
-                wasm_cache.save_cached_runtime(runtime);
+                wasm_cache.put_cached_runtime(runtime);
                 result
             }
         }

crates/iroha_core/src/smartcontracts/wasm/cache.rs

@@ -30,11 +30,13 @@ impl<'world, 'block, 'state> WasmCache<'world, 'block, 'state> {
         if let Some(cache) = wasm_cache.cache.as_ref() {
             assert!(cache.store.data().is_none());
         }
+        // SAFETY: since we have ensured that `cache.store.data()` is `None`,
+        // the lifetime parameters we are transmuting are not used by any references.
         unsafe { std::mem::transmute::<&mut WasmCache, &mut WasmCache>(wasm_cache) }
     }
 
     /// Returns cached saved runtime, or creates a new one.
-    pub fn create_runtime_cached(
+    pub fn take_or_create_cached_runtime(
         &mut self,
         state_transaction: &StateTransaction<'_, '_>,
         module: &Module,
@@ -69,7 +71,7 @@ impl<'world, 'block, 'state> WasmCache<'world, 'block, 'state> {
     }
 
     /// Saves runtime to be reused later.
-    pub fn save_cached_runtime(
+    pub fn put_cached_runtime(
         &mut self,
         runtime: RuntimeFull<ValidateTransaction<'world, 'block, 'state>>,
     ) {