There's only one type of pointer now.

Bug: b/131224163
Change-Id: Ie285affbdd05fdfc878f8144b3c6569547634f6d
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/29570Tested-by: Ben Clayton <bclayton@google.com>
Presubmit-Ready: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>