[llvm] [AMDGPU] Remove s_delay_alu for VALU->SGPR->SALU (PR #127212)

[Jay Foad via llvm-commits]

================
@@ -331,6 +331,11 @@ class AMDGPUInsertDelayAlu {
     bool Changed = false;
     MachineInstr *LastDelayAlu = nullptr;
 
+    bool VALUSALUStall = false;
+    MCRegUnit lastSgprWrite = 0;
+    MCRegUnit longestWait = 0;
+    unsigned deletedCyclesNum = 0;
----------------
jayfoad wrote:

In LLVM style variable names start with an upper case letter:
```suggestion
    MCRegUnit LastSgprWrite = 0;
    MCRegUnit LongestWait = 0;
    unsigned DeletedCyclesNum = 0;
```

https://github.com/llvm/llvm-project/pull/127212