Split SetProperty(...attributes, strictmode) into AddProperty(...attributes) and SetProperty(...…

src/regexp.js

Index: src/regexp.js
diff --git a/src/regexp.js b/src/regexp.js
index 8a805b0a19b487781e2ae95c5b6220a2fd051207..86f55cfc7673afbfd7c3ad976ec26d5728ce9ab4 100644
--- a/src/regexp.js
+++ b/src/regexp.js
@@ -381,7 +381,7 @@ var lastMatchInfoOverride = null;
 function SetUpRegExp() {
   %CheckIsBootstrapping();
   %FunctionSetInstanceClassName($RegExp, 'RegExp');
-  %SetProperty($RegExp.prototype, 'constructor', $RegExp, DONT_ENUM);
+  %DefineProperty($RegExp.prototype, 'constructor', $RegExp, DONT_ENUM);
   %SetCode($RegExp, RegExpConstructor);
 
   InstallFunctions($RegExp.prototype, DONT_ENUM, $Array(