This commit pulls in a bunch of new push buffer macros which are able to
support NVIDIA's class headers, and provide more useful debug output and
error checking (compile-time, where possible) than we had previously.

Will incrementally transition each function over to the unified interfaces.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>