Reland sticky regexps https://codereview.chromium.org/567313003/

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 83fb7143c1bfe7c6830f6e6adcbba59a0840e44b..90dbfa5d1f0714e879e169a27bd5c6375143a46e 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -8034,7 +8034,13 @@ class JSRegExp: public JSObject {
   // IRREGEXP: Compiled with Irregexp.
   // IRREGEXP_NATIVE: Compiled to native code with Irregexp.
   enum Type { NOT_COMPILED, ATOM, IRREGEXP };
-  enum Flag { NONE = 0, GLOBAL = 1, IGNORE_CASE = 2, MULTILINE = 4 };
+  enum Flag {
+    NONE = 0,
+    GLOBAL = 1,
+    IGNORE_CASE = 2,
+    MULTILINE = 4,
+    STICKY = 8
+  };
 
   class Flags {
    public:
@@ -8042,6 +8048,7 @@ class JSRegExp: public JSObject {
     bool is_global() { return (value_ & GLOBAL) != 0; }
     bool is_ignore_case() { return (value_ & IGNORE_CASE) != 0; }
     bool is_multiline() { return (value_ & MULTILINE) != 0; }
+    bool is_sticky() { return (value_ & STICKY) != 0; }
     uint32_t value() { return value_; }
    private:
     uint32_t value_;