[llvm] [PowerPC] replace vector compare equal to with vector compare greater than (PR #150422)

[Tony Varghese via llvm-commits]

================
@@ -4570,6 +4570,16 @@ bool PPCDAGToDAGISel::trySETCC(SDNode *N) {
     if (Subtarget->hasSPE())
       return false;
 
+    // Optimise Not equal to zero-vector comparisons using Greater than or less
+    // than operators. Example: Consider k to be any non-zero positive value.
----------------
tonykuttai wrote:

```suggestion
    // than' operators. Example: Consider k to be any non-zero positive value.
```

https://github.com/llvm/llvm-project/pull/150422