Return undefined from RegExp.prototype.compile

src/js/regexp.js

Index: src/js/regexp.js
diff --git a/src/js/regexp.js b/src/js/regexp.js
index 0e9d3cb3d1d7333cb1cdfd822de7a27553d26889..d5e55ef3bcee3230d855e32eab9092e32a9c0d43 100644
--- a/src/js/regexp.js
+++ b/src/js/regexp.js
@@ -112,7 +112,10 @@ function RegExpCompileJS(pattern, flags) {
     pattern = REGEXP_SOURCE(pattern);
   }
 
-  return RegExpInitialize(this, pattern, flags);
+  RegExpInitialize(this, pattern, flags);
+
+  // Return undefined for compatibility with JSC.
+  // See http://crbug.com/585775 for web compat details.
 }