rpcrt4: Implement RpcBindingSetAuthInfoExW based on the implementation for RpcBindingSetAuthInfoExA.

Pass the server principal name into AcquireCredentialsHandleA.

rpcrt4: Store non-connection-specific authentication information in a ref-counted structure that is shared between connections and bindings.

rpcrt4: Fix an off-by-one error when checking the size of the buffer in NdrInterfacePointerMarshall.

This is necessary for compatibility with MS/RPC servers.

Each instruction can have a predication token. Account for it in the
trace pass, register count pass, and store it in the SHADER_OPCODE_ARG
structure for generation. MSDN claims the token is at the end of the
instruction, but that's not true - testing a demo, which lets me
manipulate the shader shows the predication token is the first source
token immediately following the destination token.

Add a bunch of marshaling tests (based on a program by Rob Shearman).