Don't store Arc<VMInterrupts> in instances

Similar to other data structures owned by the `Store` there's no need
for `Instance` to have a strong `Arc` reference, instead it's sufficient
for `Store` to have the owning reference.

crates/wasmtime/src/instance.rs

@@ -22,7 +22,7 @@ fn instantiate(
             imports,
             &mut store.signatures_mut(),
             config.memory_creator.as_ref().map(|a| a as _),
-            store.interrupts().clone(),
+            store.interrupts(),
             host,
             store.externref_activations_table() as *const VMExternRefActivationsTable as *mut _,
             store.stack_map_registry() as *const StackMapRegistry as *mut _,

crates/wasmtime/src/runtime.rs

@@ -1030,7 +1030,7 @@ impl Store {
         self.inner.signal_handler.borrow_mut()
     }
 
-    pub(crate) fn interrupts(&self) -> &Arc<VMInterrupts> {
+    pub(crate) fn interrupts(&self) -> &VMInterrupts {
         &self.inner.interrupts
     }
 
@@ -1128,7 +1128,7 @@ impl Store {
     pub fn interrupt_handle(&self) -> Result<InterruptHandle> {
         if self.engine().config().tunables.interruptable {
             Ok(InterruptHandle {
-                interrupts: self.interrupts().clone(),
+                interrupts: self.inner.interrupts.clone(),
             })
         } else {
             bail!("interrupts aren't enabled for this `Store`")

crates/wasmtime/src/trampoline/create_handle.rs

@@ -42,7 +42,7 @@ pub(crate) fn create_handle(
             store.memory_creator(),
             signatures.into_boxed_slice(),
             state,
-            store.interrupts().clone(),
+            store.interrupts(),
             store.externref_activations_table() as *const VMExternRefActivationsTable as *mut _,
             store.stack_map_registry() as *const StackMapRegistry as *mut _,
         )?;