- Add clarifying comments.
- Add self-explanatory helper functions.
- Fix typeSize to handle all Reactor types.
- Use uintptr_t base type for emulated type enum.
  Prevents 0x########00000000 from being interpreted as emulated type.

Bug b/126028338

Change-Id: Ib38cf9b59f58c0f6046f9c84a6152849791bb4ed
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/26648Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>