Add UseCounters for various standards-related code paths

src/js/harmony-unicode-regexps.js

Index: src/js/harmony-unicode-regexps.js
diff --git a/src/js/harmony-unicode-regexps.js b/src/js/harmony-unicode-regexps.js
index a43939574cc8f9d1da19103f40b882602b3aeda9..83228fc6cb0a2e45506f698d7e3cf431a3dc400e 100644
--- a/src/js/harmony-unicode-regexps.js
+++ b/src/js/harmony-unicode-regexps.js
@@ -15,6 +15,8 @@ var GlobalRegExp = global.RegExp;
 var GlobalRegExpPrototype = GlobalRegExp.prototype;
 var MakeTypeError;
 
+const kRegExpPrototypeUnicodeGetter = 11;

[adamk, 2016/01/05 19:10:09]

Hmm, it seems like only one other place (harmony-regexp.js) uses const. I'd
prefer to follow the rest of the natives and use a macro for this for now.

[Dan Ehrenberg, 2016/01/06 03:20:54]

Alright, used macros instead.

+
 utils.Import(function(from) {
   MakeTypeError = from.MakeTypeError;
 });
@@ -24,6 +26,9 @@ utils.Import(function(from) {
 // ES6 21.2.5.15.
 function RegExpGetUnicode() {
   if (!IS_REGEXP(this)) {
+    if (this === GlobalRegExpPrototype) {
+      %IncrementUseCounter(kRegExpPrototypeUnicodeGetter);
+    }
     throw MakeTypeError(kRegExpNonRegExp, "RegExp.prototype.unicode");
   }
   return !!REGEXP_UNICODE(this);