In both the classic and pastel backends, we accidentally had *3* sets of
stencil state in the draw data. The generated routines use the array
only -- the separate stencilCCW variable is never touched.

Change-Id: I7898641bc8dbf387335528da3729e30d28b996aa
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/27790Tested-by: Chris Forbes <chrisforbes@google.com>
Presubmit-Ready: Chris Forbes <chrisforbes@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>