[turbofan] Add new StringFromCharCode simplified operator.

test/unittests/compiler/node-test-utils.h

 // Copyright 2014 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.
 
 #ifndef V8_UNITTESTS_COMPILER_NODE_TEST_UTILS_H_
 #define V8_UNITTESTS_COMPILER_NODE_TEST_UTILS_H_
 
 #include "src/compiler/machine-operator.h"
 #include "src/machine-type.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ skipping 193 matching lines @@
 Matcher<Node*> IsNumberMultiply(const Matcher<Node*>& lhs_matcher,
                                 const Matcher<Node*>& rhs_matcher);
 Matcher<Node*> IsNumberShiftLeft(const Matcher<Node*>& lhs_matcher,
                                  const Matcher<Node*>& rhs_matcher);
 Matcher<Node*> IsNumberShiftRight(const Matcher<Node*>& lhs_matcher,
                                   const Matcher<Node*>& rhs_matcher);
 Matcher<Node*> IsNumberShiftRightLogical(const Matcher<Node*>& lhs_matcher,
                                          const Matcher<Node*>& rhs_matcher);
 Matcher<Node*> IsNumberImul(const Matcher<Node*>& lhs_matcher,
                             const Matcher<Node*>& rhs_matcher);
+Matcher<Node*> IsStringFromCharCode(const Matcher<Node*>& value_matcher);
 Matcher<Node*> IsAllocate(const Matcher<Node*>& size_matcher,
                           const Matcher<Node*>& effect_matcher,
                           const Matcher<Node*>& control_matcher);
 Matcher<Node*> IsLoadField(const Matcher<FieldAccess>& access_matcher,
                            const Matcher<Node*>& base_matcher,
                            const Matcher<Node*>& effect_matcher,
                            const Matcher<Node*>& control_matcher);
 Matcher<Node*> IsStoreField(const Matcher<FieldAccess>& access_matcher,
                             const Matcher<Node*>& base_matcher,
                             const Matcher<Node*>& value_matcher,
@@ skipping 165 matching lines @@
 Matcher<Node*> IsStackSlot();
 Matcher<Node*> IsTypeGuard(const Matcher<Type*>& type_matcher,
                            const Matcher<Node*>& value_matcher,
                            const Matcher<Node*>& control_matcher);
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_UNITTESTS_COMPILER_NODE_TEST_UTILS_H_