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).

So we have to access it using Get/SetWindowLong when unmapping the
message results (based on a patch by Troy Rollo).

Allows to remove special cases for window classes being Ascii and
Unicode at the same time.

Also make sure the thunk memory block has execute permissions.

- GetObject(): Set the bmBits member of the BITMAP structure to NULL
  for device-dependent bitmaps.
- New test case.

As previously mentioned, RASTOUT is invalid on pixel shaders.
On shaders 1.x, r0 is treated as the color output register:
http://www.gamedev.net/columns/hardcore/dxshader3/page2.asp
That's what we currently do in all cases, change it not to do so
for shaders >= 2.0. Support COLOROUT/DEPTHOUT instead.