[parser] Skipping inner funcs: produce correct data for var redeclarations.

src/ast/scopes.cc

Index: src/ast/scopes.cc
diff --git a/src/ast/scopes.cc b/src/ast/scopes.cc
index 175eb99b39de3c4e1686b29c4eb09d4a29077fe2..ad1c137753e475963467df4a934f414f9d649161 100644
--- a/src/ast/scopes.cc
+++ b/src/ast/scopes.cc
@@ -1083,8 +1083,14 @@ void Scope::DeclareVariableName(const AstRawString* name, VariableMode mode) {
   // Declare the variable in the declaration scope.
   if (FLAG_preparser_scope_analysis) {
     Variable* var = LookupLocal(name);
+    DCHECK_NE(var, kDummyPreParserLexicalVariable);
+    DCHECK_NE(var, kDummyPreParserVariable);
     if (var == nullptr) {
       var = DeclareLocal(name, mode);
+    } else if (!IsLexicalVariableMode(var->mode()) &&
+               !IsLexicalVariableMode(mode)) {
+      DCHECK_EQ(mode, VAR);
+      var->set_maybe_assigned();
     }
     var->set_is_used();
   } else {