Use CommonNodeCache for heap constants in ChangeLowering.

testing/gtest-type-names.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_TESTING_GTEST_TYPE_NAMES_H_
 #define V8_TESTING_GTEST_TYPE_NAMES_H_
 
 #include "include/v8stdint.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace testing {
 namespace internal {
 
-#define GET_TYPE_NAME(type)         \
-  template <>                       \
-  std::string GetTypeName<type>() { \
-    return #type;                   \
+#define GET_TYPE_NAME(type)                \
+  template <>                              \
+  inline std::string GetTypeName<type>() { \
+    return #type;                          \
   }
 GET_TYPE_NAME(int8_t)
 GET_TYPE_NAME(uint8_t)
 GET_TYPE_NAME(int16_t)
 GET_TYPE_NAME(uint16_t)
 GET_TYPE_NAME(int32_t)
 GET_TYPE_NAME(uint32_t)
 GET_TYPE_NAME(int64_t)
 GET_TYPE_NAME(uint64_t)
 GET_TYPE_NAME(float)
 GET_TYPE_NAME(double)
 #undef GET_TYPE_NAME
 
 }  // namespace internal
 }  // namespace testing
 
 #endif  // V8_TESTING_GTEST_TYPE_NAMES_H_