Use matching llvm-profdata
when using multiple clang compilers in parallel, it is necessary to use
a matching llvm-profdata, as the profile data format may change between
versions. To use the proper llvm-profdata binary, the one in the same directory
as the compiler is used. This allows for code like:
```bash
echo "Compiling clang"
for comp in clang++-11 clang++-12 clang++-13 clang++-14 clang++-15 clang++-16 clang++-17 clang++-18 clang++-19 clang++-20
do
make -j profile-build CXX=$comp COMP=clang >& out.compile.$comp
mv stockfish stockfish.$comp
done
```
after installing the required versions with the automatic installation script (https://apt.llvm.org/)
closes https://github.com/official-stockfish/Stockfish/pull/5958
No functional change