[clang] [flang] [flang][OpenMP] Upstream `do concurrent` loop-nest detection. (PR #127595)

[Sergio Afonso via cfe-commits]

================
@@ -31,6 +158,14 @@ class DoConcurrentConversion : public 
mlir::OpConversionPattern<fir::DoLoopOp> {
   mlir::LogicalResult
   matchAndRewrite(fir::DoLoopOp doLoop, OpAdaptor adaptor,
                   mlir::ConversionPatternRewriter &rewriter) const override {
+    looputils::LoopNest loopNest;
+    bool hasRemainingNestedLoops =
+        failed(looputils::collectLoopNest(doLoop, loopNest));
+    if (hasRemainingNestedLoops)
+      mlir::emitWarning(doLoop.getLoc(),
+                        "Some `do concurent` loops are not perfectly-nested. "
+                        "These will be serialzied.");
----------------
skatrak wrote:

```suggestion
                        "These will be serialized.");
```

https://github.com/llvm/llvm-project/pull/127595
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