fix docs

Author: Thorsten Schütt

llvm/include/llvm/CodeGen/GlobalISel/CombinerHelper.h

@@ -594,10 +594,6 @@ class CombinerHelper {
   /// This variant does not erase \p MI after calling the build function.
   void applyBuildFnNoErase(MachineInstr &MI, BuildFnTy &MatchInfo);
 
-  /// Use a function which takes in a MachineIRBuilder to perform a combine.
-  /// By default, it erases the instruction \p MI from the function.
-  void applyBuildFnMO(const MachineOperand &MO, BuildFnTy &MatchInfo);
-
   bool matchOrShiftToFunnelShift(MachineInstr &MI, BuildFnTy &MatchInfo);
   bool matchFunnelShiftToRotate(MachineInstr &MI);
   void applyFunnelShiftToRotate(MachineInstr &MI);
@@ -853,6 +849,9 @@ class CombinerHelper {
   /// register and different indices.
   bool matchExtractVectorElementWithDifferentIndices(const MachineOperand &MO,
                                                      BuildFnTy &MatchInfo);
+  /// Use a function which takes in a MachineIRBuilder to perform a combine.
+  /// By default, it erases the instruction def'd on \p MO from the function.
+  void applyBuildFnMO(const MachineOperand &MO, BuildFnTy &MatchInfo);
 
 private:
   /// Checks for legality of an indexed variant of \p LdSt.