These currently do not work.

Bug: b/130343040
Change-Id: Ia97b611f44a5a048f324daa236e84e933a2c6b67
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/29033
Presubmit-Ready: Ben Clayton <bclayton@google.com>
Reviewed-by: Chris Forbes <chrisforbes@google.com>
Tested-by: Ben Clayton <bclayton@google.com>