[clang] [llvm] [clang] Implement lifetime analysis for lifetime_capture_by(X) (PR #115921)

[Boaz Brickner via llvm-commits]

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bricknerb wrote:

Do we have tests for bad usage of [[lifetime_capture_by]] ?
For example, wrong number of parameters, "X" not defined, "X" is not an object that can actually capture something (for example: an integer passed by value) etc. ?
Perhaps some of these we don't catch, but might be worth to explicitly list them.

https://github.com/llvm/llvm-project/pull/115921