[PATCH] D82771: [ASTMatcher] Fix a performance regression: memorize the child match.

[Haojian Wu via Phabricator via cfe-commits]

hokein marked an inline comment as done.
hokein added a comment.

In D82771#2120214 <https://reviews.llvm.org/D82771#2120214>, @klimek wrote:

> In what situation are we calling child matchers repeatedly with the same matcher on the same node?


I guess a pattern like https://github.com/llvm/llvm-project/blob/master/clang-tools-extra/clang-tidy/readability/ContainerSizeEmptyCheck.cpp#L29-L40?


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