Improve Hydrogen code for accessing undefined/null/Infinity.

src/factory.h

Index: src/factory.h
===================================================================
--- src/factory.h	(revision 9392)
+++ src/factory.h	(working copy)
@@ -444,6 +444,10 @@
                              JSRegExp::Flags flags,
                              int capture_count);
 
+  // Returns the value for a known global constant like 'undefined' or
+  // a null handle when the given name is unknown.

[Steven, 2011/09/22 13:57:23]

Add a comment that those properties of the global object are not 'configurable'
and not 'writable', i.e. they are really global constants.

[Sven Panne, 2011/09/23 07:59:49]

Done.

+  Handle<Object> GlobalConstantFor(Handle<String> name);
+
  private:
   Isolate* isolate() { return reinterpret_cast<Isolate*>(this); }