[hir] Skip only MemberExpressions

Identifiers don't need skipping anyways, so this doesn't affect the existing 
behavior. 

In the future, we will special case handling of LHS of AssignmentExpression 
which will require us to not skip the RHS.

compiler/forget/src/HIR/BuildHIR.ts

@@ -2174,13 +2174,16 @@ function gatherCapturedDeps(
         return;
       }
 
-      // For CallExpression, we need to depend on the receiver, not the
-      // function itself.
-      if (path.parent.type === "CallExpression" && path.isMemberExpression()) {
-        path = path.get("object");
+      if (path.isMemberExpression()) {
+        // For CallExpression, we need to depend on the receiver, not the
+        // function itself.
+        if (path.parent.type === "CallExpression") {
+          path = path.get("object");
+        }
+
+        path.skip();
       }
 
-      path.skip();
       capturedIds.add(binding.identifier);
       capturedRefs.add(lowerExpressionToTemporary(builder, path));
     },