Instrumentation of empty void functions

Functions with return type void and empty body cannot be instrumented. The instrumentation fails with

/usr/lib/llvm-8/include/llvm/Support/Casting.h:106: static
bool llvm::isa_impl_cl<To, const From*>::doit(const From*) [with To =
clang::ReturnStmt; From = clang::Stmt]: Assertion `Val && "isa<> used on a
null pointer"' failed.

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