Decode MIMG opcode 0x80 on 2D MSAA and 2D MSAA array images with a
single-bit dmask and return four dwords: the selected component of the
fragment named in the address and the three that follow it. Each fragment
is read with its own image fetch, adding the fragment step to the packed
address dword so a16 layouts keep working.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>