Fix Unicode string normalization with null bytes

src/runtime/runtime-i18n.cc

Index: src/runtime/runtime-i18n.cc
diff --git a/src/runtime/runtime-i18n.cc b/src/runtime/runtime-i18n.cc
index e1f0c8e959f523c81f134cd2fe17742ec1b01a39..e57f8d3626e2b7baeaf6d16bf395b7d952486b01 100644
--- a/src/runtime/runtime-i18n.cc
+++ b/src/runtime/runtime-i18n.cc
@@ -586,8 +586,9 @@ RUNTIME_FUNCTION(Runtime_StringNormalize) {
 
   // TODO(mnita): check Normalizer2 (not available in ICU 46)
   UErrorCode status = U_ZERO_ERROR;
+  icu::UnicodeString input(false, u_value, string_value.length());
   icu::UnicodeString result;
-  icu::Normalizer::normalize(u_value, normalizationForms[form_id], 0, result,
+  icu::Normalizer::normalize(input, normalizationForms[form_id], 0, result,
                              status);
   if (U_FAILURE(status)) {
     return isolate->heap()->undefined_value();