Introduce --print-all-code flag and infrastructure for one flag to imply another flag.

src/v8.cc

Index: src/v8.cc
diff --git a/src/v8.cc b/src/v8.cc
index 634c5c3e7b86779eccf22eb2c79bf26fb6e54ddc..0354fc101a884c902664c14224306ed246ae466e 100644
--- a/src/v8.cc
+++ b/src/v8.cc
@@ -57,14 +57,7 @@ static EntropySource entropy_source;
 
 
 bool V8::Initialize(Deserializer* des) {
-  // Setting --harmony implies all other harmony flags.
-  // TODO(rossberg): Is there a better place to put this?
-  if (FLAG_harmony) {
-    FLAG_harmony_typeof = true;
-    FLAG_harmony_scoping = true;
-    FLAG_harmony_proxies = true;
-    FLAG_harmony_collections = true;
-  }
+  FlagList::EnforceFlagImplications();
 
   InitializeOncePerProcess();