message: Improve RedexContext mutate method assert
  Summary: I was running into collisions and the old debug message was cryptic so I added this. Might be worth committing for future issues.
diff: @@ -322,8 +322,13 @@ void RedexContext::mutate_method(DexMethodRef* method,
  }
  }
  + if (s_method_map.count(r)) {
  + auto& m = *s_method_map.find(r)->second;
  always_assert_log(!s_method_map.count(r),
  - "Another method of the same signature already exists");
  + "Another method of the same signature already exists %s"
  + " %s %s",
  + SHOW(r.cls), SHOW(r.name), SHOW(r.proto));
  + }
  s_method_map.emplace(r, method);
  // We just updated DexMethodSpec, which will update this method's name.
  