Use fstatat() in pal::readdir() instead of building a std::string
Use fstatat() in pal::readdir() instead of building a std::string

fstatat(2) is equivalent to stat(2), but it takes a file descriptor for
a directory, so that lookups are always relative to that file
descriptor.  There's no need to construct a temporary std::string.

crummel/dotnet_core-setup,MichaelSimons/core-setup,crummel/dotnet_core-setup,MichaelSimons/core-setup,crummel/dotnet_core-setup,crummel/dotnet_core-setup,crummel/dotnet_core-setup,MichaelSimons/core-setup,MichaelSimons/core-setup,crummel/dotnet_core-setup,MichaelSimons/core-setup,MichaelSimons/core-setup