The parent change replaced all UNIMPLEMENTED() with UNSUPPORTED(), since
we are now Vulkan 1.1 conformant and the majority of these
UNIMPLEMENTED() uses was for functionality that is not mandatory to
still implement and is instead part of a currently unsupported feature.

This change conservatively restores uses of UNIMPLEMENTED() for things
that we might hit with correctly behaving apps. Bugs will be filed for
each of these and tests will be added where necessary to provide
coverage of these code paths.

Bug: b/131243109
Change-Id: Iaf547983c8495ad8d6d0c783a4c656273d8c0195
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/40409
Presubmit-Ready: Nicolas Capens <nicolascapens@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>