[DebugInfo][RemoveDIs] Remove some debug intrinsic-only codepaths (#143451)

These are opportunistic deletions as more places that make use of the
IsNewDbgInfoFormat flag are removed. It should (TM)(R) all be dead code
now that `IsNewDbgInfoFormat` should be true everywhere.

FastISel: we don't need to do debug-aware instruction counting any more,
because there are no debug instructions,
Autoupgrade: you can no-longer avoid autoupgrading of intrinsics to
records
DIBuilder: Delete the code for creating debug intrinsics (!)
LoopUtils: No need to handle debug instructions, they don't exist

1 files changed, 4 insertions, 15 deletions

diff --git a/llvm/lib/IR/DebugInfo.cpp b/llvm/lib/IR/DebugInfo.cpp
index 7db9891..2a84e7b 100644
--- a/llvm/lib/IR/DebugInfo.cpp
+++ b/llvm/lib/IR/DebugInfo.cpp
@@ -2123,22 +2123,11 @@ static void emitDbgAssign(AssignmentInfo Info, Value *Val, Value *Dest,
     Expr = *R;
   }
   DIExpression *AddrExpr = DIExpression::get(StoreLikeInst.getContext(), {});
-  if (StoreLikeInst.getParent()->IsNewDbgInfoFormat) {
-    auto *Assign = DbgVariableRecord::createLinkedDVRAssign(
-        &StoreLikeInst, Val, VarRec.Var, Expr, Dest, AddrExpr, VarRec.DL);
-    (void)Assign;
-    LLVM_DEBUG(if (Assign) errs() << " > INSERT: " << *Assign << "\n");
-    return;
-  }
-  auto Assign = DIB.insertDbgAssign(&StoreLikeInst, Val, VarRec.Var, Expr, Dest,
-                                    AddrExpr, VarRec.DL);
+  auto *Assign = DbgVariableRecord::createLinkedDVRAssign(
+      &StoreLikeInst, Val, VarRec.Var, Expr, Dest, AddrExpr, VarRec.DL);
   (void)Assign;
-  LLVM_DEBUG(if (!Assign.isNull()) {
-    if (const auto *Record = dyn_cast<DbgRecord *>(Assign))
-      errs() << " > INSERT: " << *Record << "\n";
-    else
-      errs() << " > INSERT: " << *cast<Instruction *>(Assign) << "\n";
-  });
+  LLVM_DEBUG(if (Assign) errs() << " > INSERT: " << *Assign << "\n");
+  return;
 }
 
 #undef DEBUG_TYPE // Silence redefinition warning (from ConstantsContext.h).