Internalize strings in-place

src/objects-body-descriptors-inl.h

 // 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.
 
 #ifndef V8_OBJECTS_BODY_DESCRIPTORS_INL_H_
 #define V8_OBJECTS_BODY_DESCRIPTORS_INL_H_
 
 #include "src/objects-body-descriptors.h"
 
 namespace v8 {
@@ skipping 422 matching lines @@
 
 template <typename Op, typename ReturnType, typename T1, typename T2,
           typename T3>
 ReturnType BodyDescriptorApply(InstanceType type, T1 p1, T2 p2, T3 p3) {
   if (type < FIRST_NONSTRING_TYPE) {
     switch (type & kStringRepresentationMask) {
       case kSeqStringTag:
         return ReturnType();
       case kConsStringTag:
         return Op::template apply<ConsString::BodyDescriptor>(p1, p2, p3);
+      case kThinStringTag:
+        return Op::template apply<ThinString::BodyDescriptor>(p1, p2, p3);
       case kSlicedStringTag:
         return Op::template apply<SlicedString::BodyDescriptor>(p1, p2, p3);
       case kExternalStringTag:
         if ((type & kStringEncodingMask) == kOneByteStringTag) {
           return Op::template apply<ExternalOneByteString::BodyDescriptor>(
               p1, p2, p3);
         } else {
           return Op::template apply<ExternalTwoByteString::BodyDescriptor>(
               p1, p2, p3);
         }
@@ skipping 157 matching lines @@
 
 template <typename ObjectVisitor>
 void HeapObject::IterateBodyFast(InstanceType type, int object_size,
                                  ObjectVisitor* v) {
   BodyDescriptorApply<CallIterateBody, void>(type, this, object_size, v);
 }
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_OBJECTS_BODY_DESCRIPTORS_INL_H_