[llvm] [AMDGPU] Correctly insert s_nops for implicit read of SDWA (PR #100276)

[Matt Arsenault via llvm-commits]

================
@@ -883,6 +883,12 @@ GCNHazardRecognizer::checkVALUHazardsHelper(const MachineOperand &Def,
   return WaitStatesNeeded;
 }
 
+/// Dest sel forwarding issue occurs if additional logic is needed to swizzle /
+/// pack the computed value into correct bit position of the dest register. This
+/// occurs if we have SDWA with dst_sel != DWORD or if we have op_sel with
+/// dst_sel that is not aligned to the register. This function analayzes the \p
+/// MI and \returns an operand with dst setl forwarding issue, or nullptr if
----------------
arsenm wrote:

Is "dst setl" a typo? 

https://github.com/llvm/llvm-project/pull/100276