[compiler-rt] [compiler-rt] [profile] Add value profile in profile data without-libc (PR #95639)

[Arthur Eubanks via llvm-commits]

aeubanks wrote:

please put `Fixes #95644` in the commit description

and please put the libc interaction details in the commit description

I'm not super familiar with PGO, but can we just fix `__llvm_profile_get_size_for_buffer` instead of introducing new APIs?

https://github.com/llvm/llvm-project/pull/95639