[LLVM] Use {} instead of std::nullopt to initialize empty ArrayRef (#109133)

It is almost always simpler to use {} instead of std::nullopt to
initialize an empty ArrayRef. This patch changes all occurrences I could
find in LLVM itself. In future the ArrayRef(std::nullopt_t) constructor
could be deprecated or removed.

1 files changed, 4 insertions, 4 deletions

diff --git a/llvm/lib/CodeGen/AssignmentTrackingAnalysis.cpp b/llvm/lib/CodeGen/AssignmentTrackingAnalysis.cpp
index 788cdfe..59257fd 100644
--- a/llvm/lib/CodeGen/AssignmentTrackingAnalysis.cpp
+++ b/llvm/lib/CodeGen/AssignmentTrackingAnalysis.cpp
@@ -966,7 +966,7 @@ public:
         auto &Ctx = Fn.getContext();
 
         for (auto &FragMemLoc : FragMemLocs) {
-          DIExpression *Expr = DIExpression::get(Ctx, std::nullopt);
+          DIExpression *Expr = DIExpression::get(Ctx, {});
           if (FragMemLoc.SizeInBits !=
               *Aggregates[FragMemLoc.Var].first->getSizeInBits())
             Expr = *DIExpression::createFragmentExpression(
@@ -1398,7 +1398,7 @@ ArrayRef<VariableID>
 AssignmentTrackingLowering::getContainedFragments(VariableID Var) const {
   auto R = VarContains.find(Var);
   if (R == VarContains.end())
-    return std::nullopt;
+    return {};
   return R->second;
 }
 
@@ -1638,7 +1638,7 @@ void AssignmentTrackingLowering::processUntaggedInstruction(
     //
     // DIExpression: Add fragment and offset.
     DebugVariable V = FnVarLocs->getVariable(Var);
-    DIExpression *DIE = DIExpression::get(I.getContext(), std::nullopt);
+    DIExpression *DIE = DIExpression::get(I.getContext(), {});
     if (auto Frag = V.getFragment()) {
       auto R = DIExpression::createFragmentExpression(DIE, Frag->OffsetInBits,
                                                       Frag->SizeInBits);
@@ -2419,7 +2419,7 @@ bool AssignmentTrackingLowering::run(FunctionVarLocsBuilder *FnVarLocsBuilder) {
         // built appropriately rather than always using an empty DIExpression.
         // The assert below is a reminder.
         assert(Simple);
-        VarLoc.Expr = DIExpression::get(Fn.getContext(), std::nullopt);
+        VarLoc.Expr = DIExpression::get(Fn.getContext(), {});
         DebugVariable Var = FnVarLocs->getVariable(VarLoc.VariableID);
         FnVarLocs->addSingleLocVar(Var, VarLoc.Expr, VarLoc.DL, VarLoc.Values);
         InsertedAnyIntrinsics = true;