Inline some trivial store accessors

These were showing up in some profiles, but they're trivial functions,
so `#[inline]` them.

crates/wasmtime/src/store.rs

@@ -726,6 +726,7 @@ impl StoreInnermost {
 
         Ok(())
     }
+
     #[inline]
     pub fn async_support(&self) -> bool {
         cfg!(feature = "async") && self.engine().config().async_support
@@ -736,10 +737,12 @@ impl StoreInnermost {
         &self.engine
     }
 
+    #[inline]
     pub fn store_data(&self) -> &StoreData {
         &self.store_data
     }
 
+    #[inline]
     pub fn store_data_mut(&mut self) -> &mut StoreData {
         &mut self.store_data
     }