[CodeGen] Model machine debug metadata

Replace marker-based metadata operands with scoped references and inline DIExpression values. Add structured DILocation chains, instruction debug attachments, stack variable records, and entry values with unified verification, builder support, and deterministic cloning.

1 files changed, 9 insertions, 0 deletions

diff --git a/backend/lib/CodeGen/MachineInstr.cpp b/backend/lib/CodeGen/MachineInstr.cpp
index aaeeacd..a8fe9b5 100644
--- a/backend/lib/CodeGen/MachineInstr.cpp
+++ b/backend/lib/CodeGen/MachineInstr.cpp
@@ -148,6 +148,15 @@ Expected<void> MachineInstr::untieOperand(std::size_t Index) {
   return {};
 }
 
+Expected<void> MachineInstr::setDebugLocation(MachineDebugLocation NewLocation) {
+  if (!NewLocation.isValid()) {
+    return makeUnexpected(ErrorCode::InvalidArgument,
+                          "machine instruction debug location must be valid");
+  }
+  DebugLocation = std::move(NewLocation);
+  return {};
+}
+
 Expected<void> MachineInstr::addMemOperand(const MachineMemOperand &MemOperand) {
   if (!OwnerFunction->ownsMemOperand(MemOperand)) {
     return makeUnexpected(ErrorCode::InvalidArgument,