[AsmPrinter] Use std::optional in DwarfCompileUnit.cpp (NFC)

This is part of an effort to migrate from llvm::Optional to
std::optional:

https://discourse.llvm.org/t/deprecating-llvm-optional-x-hasvalue-getvalue-getvalueor/63716

diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
index 190d7c5..7437ed6 100644 (file)
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
@@ -36,6 +36,7 @@
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Target/TargetOptions.h"
 #include <iterator>
+#include <optional>
 #include <string>
 #include <utility>
 
@@ -203,7 +204,7 @@ void DwarfCompileUnit::addLocationAttribute(
     DIE *VariableDIE, const DIGlobalVariable *GV, ArrayRef<GlobalExpr> GlobalExprs) {
   bool addToAccelTable = false;
   DIELoc *Loc = nullptr;
-  Optional<unsigned> NVPTXAddressSpace;
+  std::optional<unsigned> NVPTXAddressSpace;
   std::unique_ptr<DIEDwarfExpression> DwarfExpr;
   for (const auto &GE : GlobalExprs) {
     const GlobalVariable *Global = GE.Var;
@@ -847,7 +848,7 @@ DIE *DwarfCompileUnit::constructVariableDIEImpl(const DbgVariable &DV,
   if (!DV.hasFrameIndexExprs())
     return VariableDie;
 
-  Optional<unsigned> NVPTXAddressSpace;
+  std::optional<unsigned> NVPTXAddressSpace;
   DIELoc *Loc = new (DIEValueAllocator) DIELoc;
   DIEDwarfExpression DwarfExpr(*Asm, *this, *Loc);
   for (const auto &Fragment : DV.getFrameIndexExprs()) {