Adding visitors to regurgitate expression types or reset them.

src/typing-reset.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 "src/v8.h"
+
+#include "src/typing-reset.h"
+
+#include "src/ast.h"
+#include "src/codegen.h"
+#include "src/scopes.h"
+
+namespace v8 {
+namespace internal {
+
+
+TypingReseter::TypingReseter(CompilationInfo* info)
+    : AstExpressionVisitor(info), info_(info) {}
+
+
+void TypingReseter::VisitExpression(Expression* expression) {
+  expression->set_bounds(Bounds::Unbounded(info_->zone()));
+}
+}
+}  // namespace v8::internal