Track ascii-ness of data in externalized strings.

src/objects-debug.cc

Index: src/objects-debug.cc
diff --git a/src/objects-debug.cc b/src/objects-debug.cc
index f9b20a4b4912270a58bcf0b34ad9a2a0f08f5904..b60e54d3135d638a52312c2b10b94bcb9b6e1039 100644
--- a/src/objects-debug.cc
+++ b/src/objects-debug.cc
@@ -552,12 +552,14 @@ static const char* TypeToString(InstanceType type) {
     case CONS_SYMBOL_TYPE: return "CONS_SYMBOL";
     case CONS_ASCII_SYMBOL_TYPE: return "CONS_ASCII_SYMBOL";
     case EXTERNAL_ASCII_SYMBOL_TYPE:
+    case EXTERNAL_SYMBOL_WITH_ASCII_DATA_TYPE:
     case EXTERNAL_SYMBOL_TYPE: return "EXTERNAL_SYMBOL";
     case ASCII_STRING_TYPE: return "ASCII_STRING";
     case STRING_TYPE: return "TWO_BYTE_STRING";
     case CONS_STRING_TYPE:
     case CONS_ASCII_STRING_TYPE: return "CONS_STRING";
     case EXTERNAL_ASCII_STRING_TYPE:
+    case EXTERNAL_STRING_WITH_ASCII_DATA_TYPE:
     case EXTERNAL_STRING_TYPE: return "EXTERNAL_STRING";
     case FIXED_ARRAY_TYPE: return "FIXED_ARRAY";
     case BYTE_ARRAY_TYPE: return "BYTE_ARRAY";