VectorICs: recreate feedback vector if scoping changes on recompile.

src/compiler.cc

Index: src/compiler.cc
diff --git a/src/compiler.cc b/src/compiler.cc
index 00a228238f98574a0949ba396a29ac32c3d2d220..f2a3a3243f10f2a23fcfa97c51f048f978cd44a8 100644
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -251,7 +251,8 @@ bool CompilationInfo::ShouldSelfOptimize() {
 
 
 void CompilationInfo::EnsureFeedbackVector() {
-  if (feedback_vector_.is_null()) {
+  if (feedback_vector_.is_null() ||
+      feedback_vector_->SpecDiffersFrom(function()->feedback_vector_spec())) {
     feedback_vector_ = isolate()->factory()->NewTypeFeedbackVector(
         function()->feedback_vector_spec());
   }