[llvm] [AMDGPU] Mark V_PK_MOV_B32 as not commutable (PR #217719)

[Matt Arsenault via llvm-commits]

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@@ -120,3 +122,32 @@ body:             |
     S_ENDPGM 0, implicit %1, implicit %2
 
 ...
+
+---
+name:            pk_mov_no_cse
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arsenm wrote:

They only use when the operands are swapped, they should still cse if they are the same 

https://github.com/llvm/llvm-project/pull/217719