[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, 6 insertions, 0 deletions

diff --git a/backend/lib/CodeGen/MachineFunctionCloner.cpp b/backend/lib/CodeGen/MachineFunctionCloner.cpp
index e12e33e..dcf9712 100644
--- a/backend/lib/CodeGen/MachineFunctionCloner.cpp
+++ b/backend/lib/CodeGen/MachineFunctionCloner.cpp
@@ -386,6 +386,12 @@ cloneMemOperand(const MachineMemOperand &SourceOperand, CloneState &State) {
       if (SourceInstruction->sourceLocation()) {
         NewInstruction->setSourceLocation(*SourceInstruction->sourceLocation());
       }
+      if (SourceInstruction->debugLocation()) {
+        auto DebugLocationResult =
+            NewInstruction->setDebugLocation(*SourceInstruction->debugLocation());
+        if (!DebugLocationResult)
+          return std::unexpected(DebugLocationResult.error());
+      }
       if (SourceInstruction->origin())
         NewInstruction->setOrigin(*SourceInstruction->origin());
       if (SourceInstruction->debugInstrNumber() != 0) {