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

[Hans Wennborg via cfe-commits]

zmodem wrote:

We're hitting test failures on Windows as well after the re-land (7e3735d1a1b85cea48feb45cb7c2b5d8eaa216ae). It seems to only reproduce on Windows with ThinLTO, and causes some libclang and clangd lit tests to crash. (Our bug: https://crbug.com/397252105).

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