[llvm] [CodeGen] Remove NoSignedZerosFPMath uses (PR #156147)

[Sergei Barannikov via llvm-commits]

================
@@ -19195,9 +19188,8 @@ SDValue DAGCombiner::visitFNEG(SDNode *N) {
   // FIXME: This is duplicated in getNegatibleCost, but getNegatibleCost doesn't
   // know it was called from a context with a nsz flag if the input fsub does
   // not.
-  if (N0.getOpcode() == ISD::FSUB &&
-      (DAG.getTarget().Options.NoSignedZerosFPMath ||
-       N->getFlags().hasNoSignedZeros()) && N0.hasOneUse()) {
+  if (N0.getOpcode() == ISD::FSUB && (N->getFlags().hasNoSignedZeros()) &&
----------------
s-barannikov wrote:

```suggestion
  if (N0.getOpcode() == ISD::FSUB && N->getFlags().hasNoSignedZeros() &&
```

https://github.com/llvm/llvm-project/pull/156147