[llvm] [SelectionDAG] Consistently use doxygen comments in the NodeType enum. NFC (PR #172178)

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git-clang-format --diff origin/main HEAD --extensions h -- llvm/include/llvm/CodeGen/ISDOpcodes.h --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/include/llvm/CodeGen/ISDOpcodes.h b/llvm/include/llvm/CodeGen/ISDOpcodes.h
index 447110427..9ac0e7699 100644
--- a/llvm/include/llvm/CodeGen/ISDOpcodes.h
+++ b/llvm/include/llvm/CodeGen/ISDOpcodes.h
@@ -1504,14 +1504,17 @@ enum NodeType {
   /// Accumulator before multiplying their results.
   /// This result is concatenated to the Accumulator, and this is then reduced,
   /// using addition, to the result type.
-  /// The output is only expected to either be given to another partial reduction
+  /// The output is only expected to either be given to another partial
+  /// reduction
   /// operation or an equivalent vector reduce operation, so the order in which
   /// the elements are reduced is deliberately not specified.
-  /// Input1 and Input2 must be the same type. Accumulator and the output must be
+  /// Input1 and Input2 must be the same type. Accumulator and the output must
+  /// be
   /// the same type.
   /// The number of elements in Input1 and Input2 must be a positive integer
   /// multiple of the number of elements in the Accumulator / output type.
-  /// Input1 and Input2 must have an element type which is the same as or smaller
+  /// Input1 and Input2 must have an element type which is the same as or
+  /// smaller
   /// than the element type of the Accumulator and output.
   PARTIAL_REDUCE_SMLA,  // sext, sext
   PARTIAL_REDUCE_UMLA,  // zext, zext
@@ -1573,7 +1576,8 @@ enum NodeType {
   /// Output: Mask
   ///
   /// Note: The semantics of these opcodes differ slightly from the intrinsics.
-  /// Wherever "lane" (meaning lane index) occurs in the intrinsic definition, it
+  /// Wherever "lane" (meaning lane index) occurs in the intrinsic definition,
+  /// it
   /// is replaced with (lane + lane_offset) for the ISD opcode.
   ///
   ///  E.g., for LOOP_DEPENDENCE_WAR_MASK:

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https://github.com/llvm/llvm-project/pull/172178