Booleans and integer types smaller than 32-bit are not readily
supported as arguments by Subzero.

Was broken by https://swiftshader-review.googlesource.com/27251

Change-Id: I0803037100b107ca9f7b627c2effd0493b8ab1a8
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/27390Tested-by: Nicolas Capens <nicolascapens@google.com>
Presubmit-Ready: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>