[clang] [llvm-profdata] Do not create numerical strings for MD5 function names read from a Sample Profile. (PR #66164)

[Matthias Braun via cfe-commits]

MatzeB wrote:

> There are two ways ProfileFuncRef can originate (ignoring copy constructions):
> ...
So you are saying there can be hashcode `ProfileFuncRef`s coming from the profile, but an `llvm::Function` would always produce a string `ProfileFuncRef`?

> B - Whenever we lookup a ProflieFuncRef-keyed map, we need to make sure the key we query has the same representation as the keys in the map.
But doesn't `SampleProfileReader::getSamplesFor(const Function &F)` create a string `ProfileFuncRef` and uses that for a lookup?

https://github.com/llvm/llvm-project/pull/66164