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zink: unset src access in barriers if there's no src pipeline stages

Mike Blumenkrantz requested to merge zmike/mesa:zink-barrier into main

this is a partial barrier, so having access of any kind is invalid

VUID-vkCmdPipelineBarrier-srcAccessMask-02815(ERROR / SPEC): msgNum: 618171435 - Validation Error: [ VUID-vkCmdPipelineBarrier-srcAccessMask-02815 ] Object 0: handle = 0x2834530, type = VK_OBJECT_TYPE_COMMAND_BUFFER; | MessageID = 0x24d88c2b | vkCmdPipelineBarrier(): .pImageMemoryBarriers[0].srcAccessMask bit VK_ACCESS_TRANSFER_READ_BIT is not supported by stage mask (VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT). The Vulkan spec states: The srcAccessMask member of each element of pMemoryBarriers must only include access flags that are supported by one or more of the pipeline stages in srcStageMask, as specified in the table of supported access types (https://www.khronos.org/registry/vulkan/specs/1.2-extensions/html/vkspec.html#VUID-vkCmdPipelineBarrier-srcAccessMask-02815)
    Objects: 1
        [0] 0x2834530, type: 6, name: NULL
zink DEBUG: ERR: 'Validation Error: [ VUID-vkCmdPipelineBarrier-srcAccessMask-02815 ] Object 0: handle = 0x2834530, type = VK_OBJECT_TYPE_COMMAND_BUFFER; | MessageID = 0x24d88c2b | vkCmdPipelineBarrier(): .pImageMemoryBarriers[0].srcAccessMask bit VK_ACCESS_TRANSFER_READ_BIT is not supported by stage mask (VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT). The Vulkan spec states: The srcAccessMask member of each element of pMemoryBarriers must only include access flags that are supported by one or more of the pipeline stages in srcStageMask, as specified in the table of supported access types (https://www.khronos.org/registry/vulkan/specs/1.2-extensions/html/vkspec.html#VUID-vkCmdPipelineBarrier-srcAccessMask-02815)'

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