Ensure hole checks take place in switch statement scopes

src/full-codegen/full-codegen.h

Index: src/full-codegen/full-codegen.h
diff --git a/src/full-codegen/full-codegen.h b/src/full-codegen/full-codegen.h
index e8e8707c6b2a27f2811db8bd8d9259cfab0d8a4b..d86e2eed08c866faf384aa1dcaa62f8ec916fcb9 100644
--- a/src/full-codegen/full-codegen.h
+++ b/src/full-codegen/full-codegen.h
@@ -701,6 +701,8 @@ class FullCodeGenerator: public AstVisitor {
   FunctionLiteral* literal() { return info_->literal(); }
   Scope* scope() { return scope_; }
 
+  bool NeedsHoleCheck(VariableProxy* proxy);
+
   static Register result_register();
   static Register context_register();