spirv: Handle Op*MulExtended for non-32-bit types
Fixes: 58bcebd9 ("spirv: Allow [i/u]mulExtended to use new nir opcode") Related: #6306 (closed)
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Fixes: 58bcebd9 ("spirv: Allow [i/u]mulExtended to use new nir opcode") Related: #6306 (closed)