8233913: Remove implicit conversion from Method* to methodHandle

Fix call sites to use existing THREAD local or pass down THREAD local for shallower callsites. Make linkResolver methods return Method* for caller to handleize if needed.

Reviewed-by: iklam, thartmann, hseigel

src/hotspot/share/runtime/reflection.cpp

@@ -978,7 +978,7 @@ static methodHandle resolve_interface_call(InstanceKlass* klass,
                                        LinkInfo(klass, name, signature),
                                        true,
                                        CHECK_(methodHandle()));
-  return info.selected_method();
+  return methodHandle(THREAD, info.selected_method());
 }
 
 // Conversion