[clang] [llvm] [CaptureTracking][FunctionAttrs] Add support for CaptureInfo (PR #125880)

[Qiongsi Wu via cfe-commits]

qiongsiwu wrote:

What is the current plan for this PR? Are we still inclined to reland it this week? I would like to reduce the downstream churns it is causing. If we intend to reland it soon, I will not revert everything downstream that is related. 

https://github.com/llvm/llvm-project/pull/125880