[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, 5 insertions, 0 deletions

diff --git a/backend/lib/CodeGen/MachineFrameInfo.cpp b/backend/lib/CodeGen/MachineFrameInfo.cpp
index 58eab00..c4d3cda 100644
--- a/backend/lib/CodeGen/MachineFrameInfo.cpp
+++ b/backend/lib/CodeGen/MachineFrameInfo.cpp
@@ -77,6 +77,11 @@ Expected<void> MachineFrameInfo::verifyDescription(const StackObjectDesc &Descri
                             "stack object lifetime boundaries must not be reused");
     }
   }
+  if (Description.DebugInfo) {
+    auto DebugInfoResult = Description.DebugInfo->verifyStructure();
+    if (!DebugInfoResult)
+      return DebugInfoResult;
+  }
   return {};
 }