Add a TurboFan skeleton for StringAddStub.

src/code-stubs.cc

 // Copyright 2012 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/code-stubs.h"
 
 #include <sstream>
 
 #include "src/bootstrapper.h"
 #include "src/cpu-profiler.h"
@@ skipping 297 matching lines @@
 // static
 void BinaryOpICWithAllocationSiteStub::GenerateAheadOfTime(
     Isolate* isolate, const BinaryOpICState& state) {
   if (state.CouldCreateAllocationMementos()) {
     BinaryOpICWithAllocationSiteStub stub(isolate, state);
     stub.GetCode();
   }
 }
 
 
+std::ostream& operator<<(std::ostream& os, const StringAddFlags& flags) {
+  switch (flags) {
+    case STRING_ADD_CHECK_NONE:
+      return os << "CheckNone";
+    case STRING_ADD_CHECK_LEFT:
+      return os << "CheckLeft";
+    case STRING_ADD_CHECK_RIGHT:
+      return os << "CheckRight";
+    case STRING_ADD_CHECK_BOTH:
+      return os << "CheckBoth";
+  }
+  UNREACHABLE();
+  return os;
+}
+
+
 void StringAddStub::PrintBaseName(std::ostream& os) const {  // NOLINT
-  os << "StringAddStub";
-  if ((flags() & STRING_ADD_CHECK_BOTH) == STRING_ADD_CHECK_BOTH) {
-    os << "_CheckBoth";
-  } else if ((flags() & STRING_ADD_CHECK_LEFT) == STRING_ADD_CHECK_LEFT) {
-    os << "_CheckLeft";
-  } else if ((flags() & STRING_ADD_CHECK_RIGHT) == STRING_ADD_CHECK_RIGHT) {
-    os << "_CheckRight";
-  }
-  if (pretenure_flag() == TENURED) {
-    os << "_Tenured";
-  }
+  os << "StringAddStub_" << flags() << "_" << pretenure_flag();
 }
 
 
+void StringAddTFStub::PrintBaseName(std::ostream& os) const {  // NOLINT
+  os << "StringAddTFStub_" << flags() << "_" << pretenure_flag();
+}
+
+
 InlineCacheState CompareICStub::GetICState() const {
   CompareICState::State state = Max(left(), right());
   switch (state) {
     case CompareICState::UNINITIALIZED:
       return ::v8::internal::UNINITIALIZED;
     case CompareICState::SMI:
     case CompareICState::NUMBER:
     case CompareICState::INTERNALIZED_STRING:
     case CompareICState::STRING:
     case CompareICState::UNIQUE_NAME:
@@ skipping 671 matching lines @@
 }
 
 
 InternalArrayConstructorStub::InternalArrayConstructorStub(
     Isolate* isolate) : PlatformCodeStub(isolate) {
   InternalArrayConstructorStubBase::GenerateStubsAheadOfTime(isolate);
 }
 
 
 } }  // namespace v8::internal