[string] Widen StringIndexOf fast path

src/external-reference-table.cc

Index: src/external-reference-table.cc
diff --git a/src/external-reference-table.cc b/src/external-reference-table.cc
index f43680749f0ce9c01c706917b51066d016bfcdcb..3c32231eb42a3045bfc73722dd9147a8751f7120 100644
--- a/src/external-reference-table.cc
+++ b/src/external-reference-table.cc
@@ -239,6 +239,19 @@ void ExternalReferenceTable::AddReferences(Isolate* isolate) {
       "libc_memset");
   Add(ExternalReference::try_internalize_string_function(isolate).address(),
       "try_internalize_string_function");
+  Add(ExternalReference::search_string_raw<const uint8_t, const uint8_t>(
+          isolate)
+          .address(),
+      "search_string_raw<1-byte, 1-byte>");
+  Add(ExternalReference::search_string_raw<const uint8_t, const uc16>(isolate)
+          .address(),
+      "search_string_raw<1-byte, 2-byte>");
+  Add(ExternalReference::search_string_raw<const uc16, const uint8_t>(isolate)
+          .address(),
+      "search_string_raw<2-byte, 1-byte>");
+  Add(ExternalReference::search_string_raw<const uc16, const uc16>(isolate)
+          .address(),
+      "search_string_raw<1-byte, 2-byte>");
   Add(ExternalReference::log_enter_external_function(isolate).address(),
       "Logger::EnterExternal");
   Add(ExternalReference::log_leave_external_function(isolate).address(),