[NFC][CodeGen] Rename some functions in MachineInstr.h and remove duplicated comments
diff --git a/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp b/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
index 1ad421f..8dd8f99 100644
--- a/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
@@ -3317,7 +3317,7 @@
     Observer.changingInstr(MI);
     const auto &TII = MIRBuilder.getTII();
     MI.setDesc(TII.get(TargetOpcode::G_MUL));
-    MI.RemoveOperand(1);
+    MI.removeOperand(1);
     Observer.changedInstr(MI);
 
     auto HiPart = MIRBuilder.buildInstr(Opcode, {Ty}, {LHS, RHS});