Properly handle the possible llvm::Error coming from llvm::Expected.

Author: vgvassilev

lib/Interpreter/CppInterOp.cpp

@@ -816,13 +816,12 @@ namespace Cpp {
     };
 
     if (auto *FD = llvm::dyn_cast_or_null<FunctionDecl>(D)) {
-      if (auto FDAorErr =
-              compat::getSymbolAddress(*I, StringRef(get_mangled_name(FD)))) {
-        return reinterpret_cast<TCppFuncAddr_t>(*FDAorErr);
-      } else { // Hangle Err
-        llvm::logAllUnhandledErrors(FDAorErr.takeError(), llvm::errs(),
+      auto FDAorErr =
+          compat::getSymbolAddress(*I, StringRef(get_mangled_name(FD)));
+      if (llvm::Error Err = FDAorErr.takeError())
+        llvm::logAllUnhandledErrors(std::move(Err), llvm::errs(),
                                     "Failed to GetFunctionAdress:");
-      }
+      return llvm::jitTargetAddressToPointer<void *>(*FDAorErr);
     }
 
     return 0;