Add a version tag for cached data.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index dfb452b2a2707f1a697cc248bcff8b8a3c995b84..fddd9e82f4b286cdd49952833d81f87d300f8297 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -1846,6 +1846,12 @@ Local<Script> ScriptCompiler::Compile(Isolate* v8_isolate,
 }
 
 
+uint32_t ScriptCompiler::CachedDataVersionTag() {
+  return internal::Version::Hash() ^ internal::FlagList::Hash() ^
+         internal::CpuFeatures::SupportedFeatures();

[Sven Panne, 2014/11/12 15:55:31]

This is a very bad hash, please use the hashing facilitites from
src/base/functional.h

[vogelheim, 2014/11/12 18:34:30]

Done.

Thanks; I was looking for something like those hash functions, but somehow
didn't find them. :(

+}
+
+
 Local<Script> Script::Compile(v8::Handle<String> source,
                               v8::ScriptOrigin* origin) {
   i::Handle<i::String> str = Utils::OpenHandle(*source);