[parser] Skipping inner funcs: make basic variable declarations work.

BUG=v8:5516

Review-Url: https://codereview.chromium.org/2659053002
Cr-Commit-Position: refs/heads/master@{#42739}

src/ast/scopes.cc

@@ -1903,6 +1903,9 @@ VariableProxy* Scope::FetchFreeVariables(DeclarationScope* max_outer_scope,
         if (!var->is_dynamic() && lookup != this) var->ForceContextAllocation();
       } else {
         var->set_is_used();
+        if (proxy->is_assigned()) {
+          var->set_maybe_assigned();
+        }
       }
     }
   }

test/cctest/test-parsing.cc

@@ -9042,9 +9042,30 @@ TEST(PreParserScopeAnalysis) {
     const char* params;
     const char* source;
   } inners[] = {
-      {"", "var1"},
+      {"", "var1;"},
+      {"", "var1 = 5;"},
       {"", "if (true) {}"},
       {"", "function f1() {}"},
+
+      {"", "var var1;"},
+      {"", "var var1; var1 = 5;"},
+      {"", "if (true) { var var1; }"},
+      {"", "if (true) { var var1; var1 = 5; }"},
+      {"", "var var1; function f() { var1; }"},
+      {"", "var var1; var1 = 5; function f() { var1; }"},
+      {"", "var var1; function f() { var1 = 5; }"},
+
+      {"", "let var1;"},
+      {"", "let var1; var1 = 5;"},
+      {"", "if (true) { let var1; }"},
+      {"", "if (true) { let var1; var1 = 5; }"},
+      {"", "let var1; function f() { var1; }"},
+      {"", "let var1; var1 = 5; function f() { var1; }"},
+      {"", "let var1; function f() { var1 = 5; }"},
+
+      {"", "const var1 = 5;"},
+      {"", "if (true) { const var1 = 5; }"},
+      {"", "const var1 = 5; function f() { var1; }"},
   };
 
   for (unsigned i = 0; i < arraysize(inners); ++i) {