[llvm] [AMDGPU]: Add support to unpack V_PK_MOV_B32 (PR #163464)

[Matt Arsenault via llvm-commits]

================
@@ -1167,3 +1155,592 @@ body:             |
     $vgpr5 = V_MOV_B32_e32 killed $sgpr15, implicit $exec, implicit $exec
     renamable $vgpr16_vgpr17 = nofpexcept V_PK_MUL_F32 8, killed $sgpr30_sgpr31, 11, killed $vgpr4_vgpr5, 0, 0, 0, 0, 0, implicit $mode, implicit $exec
     S_ENDPGM 0
+
+...
+---
+name:            test_v_pk_mov_unpacking
+tracksRegLiveness: true
+
+liveins:
+  - { reg: '$sgpr4_sgpr5' }
+
----------------
arsenm wrote:

```suggestion
```

https://github.com/llvm/llvm-project/pull/163464