Blitting should be done either using the depth
aspect or the stencil aspect, not both at once.

Bug: b/144353295
Change-Id: I5b7a81d3c2b915f6ebb5854edc814f335eb2cac5
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/38470
Presubmit-Ready: Alexis Hétu <sugoi@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>