[clang-tools-extra] [clang-tidy] Add bugprone-move-shared-pointer-contents check. (PR #67467)

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pizzud wrote:

> Ack, I messed this up like whoa! Sorry for all the noise and extraneous commits sneaking in.

Okay fixed this, but i'm not sure how to unrequest reviews.

https://github.com/llvm/llvm-project/pull/67467