https://gitlab.khronos.org/opengl/API/issues/72 was resolved to treat
these cases as a no-op and not generate an error.

Bug chromium:825545

Change-Id: Ic4cfbc728156bb88a6dc70486ae57c3e12ea43ae
Reviewed-on: https://swiftshader-review.googlesource.com/18870Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>