Fix AstExpressionVisitor to correctly handle switch + for.

test/cctest/test-ast-expression-visitor.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdlib.h>
 
 #include "src/v8.h"
 
 #include "src/ast.h"
 #include "src/ast-expression-visitor.h"
@@ skipping 238 matching lines @@
         }
       }
       // return { geometricMean: geometricMean };
       CHECK_EXPR(ObjectLiteral, DEFAULT_TYPE) {
         CHECK_VAR(geometricMean, DEFAULT_TYPE);
       }
     }
   }
   CHECK_TYPES_END
 }
+
+
+TEST(VisitEmptyForStatment) {
+  v8::V8::Initialize();
+  HandleAndZoneScope handles;
+  ZoneVector<ExpressionTypeEntry> types(handles.main_zone());
+  // Check that traversing an empty for statement works.
+  const char test_function[] =
+      "function foo() {\n"
+      "  for (;;) {}\n"
+      "}\n";
+  CollectTypes(&handles, test_function, &types);
+  CHECK_TYPES_BEGIN {
+    CHECK_EXPR(FunctionLiteral, DEFAULT_TYPE) {}
+  }
+  CHECK_TYPES_END
+}
+
+
+TEST(VisitSwitchStatment) {
+  v8::V8::Initialize();
+  HandleAndZoneScope handles;
+  ZoneVector<ExpressionTypeEntry> types(handles.main_zone());
+  // Check that traversing a switch with a default works.
+  const char test_function[] =
+      "function foo() {\n"
+      "  switch (0) { case 1: break; default: break; }\n"
+      "}\n";
+  CollectTypes(&handles, test_function, &types);
+  CHECK_TYPES_BEGIN {
+    CHECK_EXPR(FunctionLiteral, DEFAULT_TYPE) {
+      CHECK_EXPR(Assignment, DEFAULT_TYPE) {
+        CHECK_VAR(.switch_tag, DEFAULT_TYPE);
+        CHECK_EXPR(Literal, DEFAULT_TYPE);
+      }
+      CHECK_VAR(.switch_tag, DEFAULT_TYPE);
+      CHECK_EXPR(Literal, DEFAULT_TYPE);
+    }
+  }
+  CHECK_TYPES_END
+}