Port and integrate the irregexp engine from V8

runtime/vm/symbols.h

Index: runtime/vm/symbols.h
diff --git a/runtime/vm/symbols.h b/runtime/vm/symbols.h
index fc8497d71788e9371d06867506c814ab9cc4617b..c55fb72f8e41c84674c0e25ccd8716dccc110565 100644
--- a/runtime/vm/symbols.h
+++ b/runtime/vm/symbols.h
@@ -18,6 +18,9 @@ class ObjectPointerVisitor;
 #define PREDEFINED_SYMBOLS_LIST(V)                                             \
   V(Empty, "")                                                                 \
   V(EqualOperator, "==")                                                       \
+  V(GreaterEqualOperator, ">=")                                                \
+  V(LessEqualOperator, "<=")                                                   \
+  V(UnaryMinus, "unary-")                                                      \
   V(Identical, "identical")                                                    \
   V(Length, "length")                                                          \
   V(IndexToken, "[]")                                                          \
@@ -325,6 +328,30 @@ class ObjectPointerVisitor;
   V(StubPrefix, "[Stub] ")                                                     \
   V(ClassID, "ClassID")                                                        \
   V(DartIsVM, "dart.isVM")                                                     \
+  V(stack_, "stack_")                                                          \
+  V(current_character_, "current_character_")                                  \
+  V(current_position_, "current_position_")                                    \
+  V(string_param_length_, "string_param_length_")                              \
+  V(capture_length_, "capture_length_")                                        \
+  V(word_character_map_, "word_character_map_")                                \
+  V(match_start_index_, "match_start_index_")                                  \
+  V(capture_start_index_, "capture_start_index_")                              \
+  V(match_end_index_, "match_end_index_")                                      \
+  V(char_in_capture_, "char_in_capture_")                                      \
+  V(char_in_match_, "char_in_match_")                                          \
+  V(result_, "result_")                                                        \
+  V(position_registers_, "position_registers_")                                \
+  V(string_param_, "string_param_")                                            \
+  V(start_index_param_, "start_index_param_")                                  \
+  V(clear, "clear")                                                            \
+  V(_wordCharacterMap, "_wordCharacterMap")                                    \
+  V(print, "print")                                                            \
+  V(last, "last")                                                              \
+  V(removeLast, "removeLast")                                                  \
+  V(add, "add")                                                                \
+  V(_oneCodeUnitAt, "_oneCodeUnitAt")                                          \
+  V(_twoCodeUnitsAt, "_twoCodeUnitsAt")                                        \
+  V(_fourCodeUnitsAt, "_fourCodeUnitsAt")                                      \
 
 
 // Contains a list of frequently used strings in a canonicalized form. This
@@ -368,6 +395,18 @@ PREDEFINED_SYMBOLS_LIST(DEFINE_SYMBOL_INDEX)
   static const String& Equals() {
     return *(symbol_handles_[kNullCharId + '=']);
   }
+  static const String& Plus() {
+    return *(symbol_handles_[kNullCharId + '+']);
+  }
+  static const String& Minus() {
+    return *(symbol_handles_[kNullCharId + '-']);
+  }
+  static const String& BitOr() {
+    return *(symbol_handles_[kNullCharId + '|']);
+  }
+  static const String& BitAnd() {
+    return *(symbol_handles_[kNullCharId + '&']);
+  }
   static const String& LAngleBracket() {
     return *(symbol_handles_[kNullCharId + '<']);
   }