perf(core): Cache source lookups (#14816)

Keep a cache for source maps and source lines. 

We sort of already had a cache argument for source map lookup 
functions but we just passed an empty map instead of storing it. 

Extended it to cache source line lookups as well and plugged it 
into runtime state.

1 files changed, 3 insertions, 3 deletions

diff --git a/core/ops_builtin_v8.rs b/core/ops_builtin_v8.rs
index 7b7cfcc45..7f0c58212 100644
--- a/core/ops_builtin_v8.rs
+++ b/core/ops_builtin_v8.rs
@@ -752,14 +752,14 @@ fn op_apply_source_map(
   location: Location,
 ) -> Result<Location, Error> {
   let state_rc = JsRuntime::state(scope);
-  let state = state_rc.borrow();
+  let state = &mut *state_rc.borrow_mut();
   if let Some(source_map_getter) = &state.source_map_getter {
     let mut location = location;
-    let (f, l, c, _) = apply_source_map_(
+    let (f, l, c) = apply_source_map_(
       location.file_name,
       location.line_number.into(),
       location.column_number.into(),
-      &mut Default::default(),
+      &mut state.source_map_cache,
       source_map_getter.as_ref(),
     );
     location.file_name = f;