malcolm.parsons added a comment.

In https://reviews.llvm.org/D26453#596254, @aaron.ballman wrote:

> (This part of the check is one half modernization, one half performance, and 
> one half correctness, depending on which lens you view the code through.)


The performance part should be handled by performance-unnecessary-value-param.
It should warn in this situation, but not create a fix that would conflict with 
modernize-pass-by-value's fix.


https://reviews.llvm.org/D26453



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