Check some more invariants on SFIs.

src/ast/scopeinfo.cc

Index: src/ast/scopeinfo.cc
diff --git a/src/ast/scopeinfo.cc b/src/ast/scopeinfo.cc
index 3a3ea031893bca06afedc53476d5bc3f61d67a6b..da0dd76635d3df280f219428551dedab4fcb2788 100644
--- a/src/ast/scopeinfo.cc
+++ b/src/ast/scopeinfo.cc
@@ -143,13 +143,15 @@ Handle<ScopeInfo> ScopeInfo::Create(Isolate* isolate, Zone* zone, Scope* scope,
   bool has_simple_parameters = false;
   bool asm_module = false;
   bool asm_function = false;
-  FunctionKind function_kind = kNormalFunction;
   if (scope->is_function_scope()) {
     DeclarationScope* function_scope = scope->AsDeclarationScope();
     has_simple_parameters = function_scope->has_simple_parameters();
     asm_module = function_scope->asm_module();
     asm_function = function_scope->asm_function();
-    function_kind = function_scope->function_kind();
+  }
+  FunctionKind function_kind = kNormalFunction;
+  if (scope->is_declaration_scope()) {
+    function_kind = scope->AsDeclarationScope()->function_kind();
   }
 
   // Encode the flags.