message: Tweak NS type declarations in metal-cpp.h
  Changes to make metal-cpp enums work nicely with RenderDoc serialization
  NS::Integer -> std::int64_t
  NS::UInteger -> std::uint64_t
  RenderDoc serialization works with fixed sized types
diff: @@ -496,8 +496,8 @@ namespace NS
  {
  using TimeInterval = double;
  -using Integer = std::intptr_t;
  -using UInteger = std::uintptr_t;
  +using Integer = std::int64_t;
  +using UInteger = std::uint64_t;
  const Integer IntegerMax = INTPTR_MAX;
  const Integer IntegerMin = INTPTR_MIN;
  