Location for plausible overloads in diagnostic

There is some reason to use getLocStart() instead of getLocation() in
noteOverloads function in Sema.cpp?

Sema.cpp:971: S.Diag(Fn->getLocStart(),

After the recent changes the output is now:

$ clang++ -c w.cc
w.cc:5:3: error: reference to overloaded function could not be resolved;
did you
      mean to call it?
w.cc:4:1: note: possible target for call
void foo(int) {
w.cc:2:1: note: possible target for call
void foo(double);
1 error generated.

Can I fix it or there are non obvious reasons for this choice?

Please go ahead and fix it, thanks!

  - Doug