Force v8::internal::HeapObjectsSet::SetTag to be out-of-lined.

This reduces the size of GetStrongGcSubrootName() from 77 KB to 10KB.

BUG=5240

Review-Url: https://codereview.chromium.org/2189633003
Cr-Commit-Position: refs/heads/master@{#38123}

src/profiler/heap-snapshot-generator.cc

@@ -751,7 +751,7 @@ const char* HeapObjectsSet::GetTag(Object* obj) {
 }
 
 
-void HeapObjectsSet::SetTag(Object* obj, const char* tag) {
+V8_NOINLINE void HeapObjectsSet::SetTag(Object* obj, const char* tag) {
   if (!obj->IsHeapObject()) return;
   HeapObject* object = HeapObject::cast(obj);
   base::HashMap::Entry* cache_entry =