Add infrastructure to automatucally generate IC miss stubs

src/ic.cc

Index: src/ic.cc
diff --git a/src/ic.cc b/src/ic.cc
index 78fb29753c4a08e2b4b52a4c6538fea5b17a848d..fbdffb06141606d2b975906dccfe33caf3f688d9 100644
--- a/src/ic.cc
+++ b/src/ic.cc
@@ -2766,6 +2766,13 @@ RUNTIME_FUNCTION(Code*, CompareIC_Miss) {
 }
 
 
+RUNTIME_FUNCTION(MaybeObject*, Unreachable) {
+  UNREACHABLE();
+  CHECK(false);
+  return isolate->heap()->undefined_value();
+}
+
+
 RUNTIME_FUNCTION(MaybeObject*, ToBoolean_Patch) {
   ASSERT(args.length() == 3);