[llvm] [Hexagon] Prevent optimizing out counter reads (PR #182338)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- llvm/lib/Target/Hexagon/HexagonAsmPrinter.cpp llvm/lib/Target/Hexagon/HexagonISelLowering.cpp llvm/lib/Target/Hexagon/HexagonISelLowering.h --diff_from_common_commit
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp b/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp
index 001fff8d5..3f2c42c84 100644
--- a/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp
@@ -3318,7 +3318,8 @@ HexagonTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const {
     case ISD::VSELECT:              return LowerVSELECT(Op, DAG);
     case ISD::INTRINSIC_WO_CHAIN:   return LowerINTRINSIC_WO_CHAIN(Op, DAG);
     case ISD::INTRINSIC_VOID:       return LowerINTRINSIC_VOID(Op, DAG);
-    case ISD::PREFETCH:             return LowerPREFETCH(Op, DAG);
+    case ISD::PREFETCH:
+      return LowerPREFETCH(Op, DAG);
       break;
   }
 

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https://github.com/llvm/llvm-project/pull/182338