[clang-tools-extra] [compiler-rt] Added support for the .yml file extension (PR #79899)

[Chris Apple via cfe-commits]

cjappl wrote:

Closing

This should be split into multiple reviews that do one small atomic thing.
The reviews should have good descriptions and tests.
You should try to minimize white space and formatting changes.

Feel free to resubmit if you think these changes still need to be made.

https://github.com/llvm/llvm-project/pull/79899