[CodeGen] Use std::nullopt instead of None (NFC)

This patch mechanically replaces None with std::nullopt where the
compiler would warn if None were deprecated.  The intent is to reduce
the amount of manual work required in migrating from Optional to
std::optional.

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

1 files changed, 4 insertions, 4 deletions

diff --git a/llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp b/llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp
index f0b1f73..1ad2362 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp
@@ -36,9 +36,9 @@ DbgVariableLocation::extractFromMachineInstruction(
   DbgVariableLocation Location;
   // Variables calculated from multiple locations can't be represented here.
   if (Instruction.getNumDebugOperands() != 1)
-    return None;
+    return std::nullopt;
   if (!Instruction.getDebugOperand(0).isReg())
-    return None;
+    return std::nullopt;
   Location.Register = Instruction.getDebugOperand(0).getReg();
   Location.FragmentInfo.reset();
   // We only handle expressions generated by DIExpression::appendOffset,
@@ -53,7 +53,7 @@ DbgVariableLocation::extractFromMachineInstruction(
         Op->getOp() == dwarf::DW_OP_LLVM_arg)
       ++Op;
     else
-      return None;
+      return std::nullopt;
   }
   while (Op != DIExpr->expr_op_end()) {
     switch (Op->getOp()) {
@@ -84,7 +84,7 @@ DbgVariableLocation::extractFromMachineInstruction(
       Offset = 0;
       break;
     default:
-      return None;
+      return std::nullopt;
     }
     ++Op;
   }