[inspector] fix positions for single expression arrow function

src/parsing/parser-base.h

Index: src/parsing/parser-base.h
diff --git a/src/parsing/parser-base.h b/src/parsing/parser-base.h
index c349cdd094855420aa2c29ff985eb2777650ce27..f178d1599b116765997074f86f56dea3e8c6090f 100644
--- a/src/parsing/parser-base.h
+++ b/src/parsing/parser-base.h
@@ -3989,7 +3989,9 @@ ParserBase<Impl>::ParseArrowFunctionLiteral(
       } else {
         ExpressionT expression = ParseAssignmentExpression(accept_IN, CHECK_OK);
         impl()->RewriteNonPattern(CHECK_OK);
-        body->Add(factory()->NewReturnStatement(expression, pos), zone());
+        body->Add(
+            factory()->NewReturnStatement(expression, expression->position()),
+            zone());
         if (allow_tailcalls() && !is_sloppy(language_mode())) {
           // ES6 14.6.1 Static Semantics: IsInTailPosition
           impl()->MarkTailPosition(expression);