C++ profiles processor: put under #ifdef and fix issues.

src/profile-generator-inl.h

Index: src/profile-generator-inl.h
diff --git a/src/profile-generator-inl.h b/src/profile-generator-inl.h
index 5e92be47017b178971e348fb983505ecdf3b5921..048beafaae196d1d271814a3fa439af1816b5165 100644
--- a/src/profile-generator-inl.h
+++ b/src/profile-generator-inl.h
@@ -33,6 +33,7 @@
 namespace v8 {
 namespace internal {
 
+#ifdef ENABLE_CPP_PROFILES_PROCESSOR
 
 CodeEntry::CodeEntry(Logger::LogEventsAndTags tag,
                      const char* name,
@@ -76,6 +77,14 @@ void CodeMap::DeleteCode(Address addr) {
 }
 
 
+bool CpuProfilesCollection::is_last_profile() {
+  // Called from VM thread, and only it can mutate the list,
+  // so no locking is needed here.
+  return current_profiles_.length() == 1;
+}
+
+#endif  // ENABLE_CPP_PROFILES_PROCESSOR
+
 } }  // namespace v8::internal
 
 #endif  // V8_PROFILE_GENERATOR_INL_H_