[llvm] [ctxprof] don't inline weak symbols after instrumentation (PR #128811)

[Teresa Johnson via llvm-commits]

teresajohnson wrote:

> If we ever want to avoid taking any hit, we can subsequently add some metadata to each such function capturing the original (if any) inline attribute; go through thinlto; then restore the original attribute from metadata after function import and let the backend inliner do its job (which, at this point, would be only working with prevailing copies)

The last part isn't quite true - non-prevailing linkonce_odr are converted to available_externally and kept around long enough to allow them to be inlined.

https://github.com/llvm/llvm-project/pull/128811