Tests like dEQP.GLES3/functional_fbo_blit_depth_stencil_depth24_stencil8_basic
were not passing when running on SWANGLE.

Bug: b/151235334
Change-Id: Icc3c4709a50c96d4552af4e4835f1e5eb43dd653
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/43028
Presubmit-Ready: Nicolas Capens <nicolascapens@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>