[llvm] [NFC][LLVM][CodeGen] Refactor MachineInstr operand accessors (PR #137261)

[Rahul Joshi via llvm-commits]

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@@ -676,68 +672,61 @@ class MachineInstr
   const_mop_iterator operands_begin() const { return Operands; }
   const_mop_iterator operands_end() const { return Operands + NumOperands; }
 
-  iterator_range<mop_iterator> operands() {
-    return make_range(operands_begin(), operands_end());
+  MutableArrayRef<MachineOperand> operands() {
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jurahul wrote:

@s-barannikov will wait a couple of days to give you a chance to look as well.

https://github.com/llvm/llvm-project/pull/137261