[builtins] Fix String.prototype.indexOf with negative positions

src/builtins/builtins-string.cc

Index: src/builtins/builtins-string.cc
diff --git a/src/builtins/builtins-string.cc b/src/builtins/builtins-string.cc
index deed60056e10e7f58aeb03b4b725d33ff5e6e59d..967fc341093a73fcde5c35aabb7b0c7213e60999 100644
--- a/src/builtins/builtins-string.cc
+++ b/src/builtins/builtins-string.cc
@@ -906,6 +906,7 @@ TF_BUILTIN(StringPrototypeIndexOf, StringBuiltinsAssembler) {
     search_string.Bind(arguments.AtIndex(0));
     position.Bind(arguments.AtIndex(1));
     GotoUnless(TaggedIsSmi(position.value()), &call_runtime);
+    position.Bind(SmiMax(position.value(), SmiConstant(0)));
     Goto(&fast_path);
   }