SelectionDAG: Do not propagate divergence through copy glue (#101210) This fixes DAG divergence mishandling inline asm. This was considering the glue nodes for divergence, when the divergence should only come from the individual CopyFromRegs that are glued. As a result, having any VGPR CopyFromRegs would taint any uniform SGPR copies as divergent, resulting in SGPR copies to VGPR virtual registers later.
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