[compiler-rt] [compiler-rt] Add baremetal version of profile library. (PR #167998)

[Sam Elliott via llvm-commits]

lenary wrote:

Thanks for the additional comments.

I agree that splitting up these files better can wait for a follow-up commit.

I am happy, but don't feel familiar enough to approve this commit.

https://github.com/llvm/llvm-project/pull/167998