The impetus for these changes was unexplained crashes in a display
driver while attempting to create a debug-instrumented shader for PIX.
The heart of it is the new test in pixtest.cpp: use the compiler to
generate a raw UAV, and then compare the generated DXIL with what PIX
generates for the same purpose.
Some of the PIX passes need only one UAV for a module, but some need two
or more. In the latter case, the previous code was a bit loose about
what it was doing with respect to adding the UAV resource, and creating
its handles for each interested function. Most of the actual changes
herein are to do with that.
Lastly, the PIX UAV is raw at the D3D API level, but the instrumentation
had been doing non-raw writes. No driver seemed to care, but I've fixed
it anyway.
(cherry picked from commit bf24b7a54d)
cf285db4ab