zequanwu added a comment.

In D136006#3864144 <https://reviews.llvm.org/D136006#3864144>, @labath wrote:

> Is this purely a performance optimization, or does it have some impact on 
> operation (its correctness) as well? E.g. does it prevent duplicate 
> construction of some types or something like that?

It's purely a performance optimization. Avoid doing some unnecessary work.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D136006/new/

https://reviews.llvm.org/D136006

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