flx added inline comments.

================
Comment at: clang-tidy/utils/TypeTraits.cpp:49
+  if (Context.getTypeSize(Type) <= Context.getTypeSize(Context.VoidPtrTy))
+    return false;
+
----------------
This early return now ignores the fact that the type has non-trivial copy 
constructors, virtual destructors etc which makes the type expensive to copy. 
Could we achieve the same desired outcome by adding a blacklist that allows 
users exclude types they deem to be not expensive?

This way they would get a warning the first time they run the check and then 
could disable such types. 


Repository:
  rCTE Clang Tools Extra

https://reviews.llvm.org/D52315



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