Add generations to the compilation cache for eval and regexp

src/compilation-cache.h

Index: src/compilation-cache.h
===================================================================
--- src/compilation-cache.h	(revision 2231)
+++ src/compilation-cache.h	(working copy)
@@ -34,20 +34,9 @@
 
 // The compilation cache keeps function boilerplates for compiled
 // scripts and evals. The boilerplates are looked up using the source
-// string as the key.
+// string as the key. For regular expressions the compilation data is cached.
 class CompilationCache {
  public:
-  // The same source code string has different compiled code for
-  // scripts and evals. Internally, we use separate caches to avoid
-  // getting the wrong kind of entry when looking up.
-  enum Entry {
-    EVAL_GLOBAL,
-    EVAL_CONTEXTUAL,
-    REGEXP,
-    SCRIPT,
-    LAST_ENTRY = SCRIPT
-  };
-
   // Finds the script function boilerplate for a source
   // string. Returns an empty handle if the cache doesn't contain a
   // script for the given source string with the right origin.
@@ -61,7 +50,7 @@
   // contain a script for the given source string.
   static Handle<JSFunction> LookupEval(Handle<String> source,
                                        Handle<Context> context,
-                                       Entry entry);
+                                       bool is_global);
 
   // Returns the regexp data associated with the given regexp if it
   // is in cache, otherwise an empty handle.
@@ -77,7 +66,7 @@
   // with the boilerplate. This may overwrite an existing mapping.
   static void PutEval(Handle<String> source,
                       Handle<Context> context,
-                      Entry entry,
+                      bool is_global,
                       Handle<JSFunction> boilerplate);
 
   // Associate the (source, flags) pair to the given regexp data.