[regexp] Add support for dotAll flag

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 57fbaaef10371c20e1aa3190e8837080c80e335a..afa48bedd523d1847fac057bb113a00755d46efb 100644
--- a/src/external-reference-table.cc
+++ b/src/external-reference-table.cc
@@ -273,6 +273,9 @@ void ExternalReferenceTable::AddReferences(Isolate* isolate) {
   Add(ExternalReference::debug_restart_fp_address(isolate).address(),
       "Debug::restart_fp_address()");
 
+  Add(ExternalReference::address_of_regexp_dotall_flag(isolate).address(),
+      "FLAG_harmony_regexp_dotall");
+
 #ifndef V8_INTERPRETED_REGEXP
   Add(ExternalReference::re_case_insensitive_compare_uc16(isolate).address(),
       "NativeRegExpMacroAssembler::CaseInsensitiveCompareUC16()");