I/O normalisation is already a rather complicated pass that does a
lot of things, so it's better to keep anything not strictly
related to it somewhere else.
ERR is used to indicate internal inconsistencies in vkd3d. Here that's
not the case, we simply have to forward the error condition to the
caller.
This fixes failures on the CI with llvmpipe, because the build we use is
compiled without support for VK_KHR_surface and related extensions.
Similarly to RADV, this is a kind of perverted situation: in
principle Vulkan doesn't allow vkCmdResolveImage() to be
executed conditionally (i.e., it is unaffected by conditional
execution), which means that vkd3d cannot implement conditional
rendering for ResolveSubresource(), hence the todo. However,
like RADV, llvmpipe apparently violates the specification and
still executes the image resolution command conditionally. So
that's a llvmpipe bug, even if one that helps us doing the right
thing.
Fixes output signature normalisation failures in Silent Hill 2 caused by
failure of shader_signature_find_element_for_reg().
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=57359
