Tell C++ class method from free function in LLVM IR. Which metadata or attribute to use?

Is there a way to tell if a callable object in LLVM IR is a class method (member function) (not free function)? I’m imagining some metadata or attribute may have that information.
Compiler Explorer is a small example. _ZN1A1aEv is a method of class A.

Looks like debug information could help (by removing -g0 in the previous example some debug information about class methods show up Compiler Explorer)