[CodeGen] Add transactional MachineIR builder

Validate insertion cursors, operand ownership, descriptor constraints, ties, implicit registers, and memory operands before allocating or publishing an instruction. Share instruction legality checks with the verifier path and preserve deterministic insertion order.

1 files changed, 2 insertions, 2 deletions

diff --git a/backend/include/rcc/CodeGen/MachineInstr.h b/backend/include/rcc/CodeGen/MachineInstr.h
index 376273f..bcae306 100644
--- a/backend/include/rcc/CodeGen/MachineInstr.h
+++ b/backend/include/rcc/CodeGen/MachineInstr.h
@@ -87,8 +87,8 @@ public:
   }
 
   void reserveOperands(std::size_t Capacity);
-  [[nodiscard]] Expected<void> addOperand(MachineOperand Operand);
-  [[nodiscard]] Expected<void> insertOperand(std::size_t Index, MachineOperand Operand);
+  [[nodiscard]] Expected<void> addOperand(MachineOperand &&Operand);
+  [[nodiscard]] Expected<void> insertOperand(std::size_t Index, MachineOperand &&Operand);
   [[nodiscard]] Expected<void> eraseOperand(std::size_t Index);
 
   [[nodiscard]] Expected<void> tieOperands(std::size_t DefIndex, std::size_t UseIndex);