[Transforms] 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, 3 insertions, 3 deletions

diff --git a/llvm/lib/Transforms/Utils/PredicateInfo.cpp b/llvm/lib/Transforms/Utils/PredicateInfo.cpp
index 92bbbe6..9a1f334 100644
--- a/llvm/lib/Transforms/Utils/PredicateInfo.cpp
+++ b/llvm/lib/Transforms/Utils/PredicateInfo.cpp
@@ -800,7 +800,7 @@ Optional<PredicateConstraint> PredicateBase::getConstraint() const {
     CmpInst *Cmp = dyn_cast<CmpInst>(Condition);
     if (!Cmp) {
       // TODO: Make this an assertion once RenamedOp is fully accurate.
-      return None;
+      return std::nullopt;
     }
 
     CmpInst::Predicate Pred;
@@ -813,7 +813,7 @@ Optional<PredicateConstraint> PredicateBase::getConstraint() const {
       OtherOp = Cmp->getOperand(0);
     } else {
       // TODO: Make this an assertion once RenamedOp is fully accurate.
-      return None;
+      return std::nullopt;
     }
 
     // Invert predicate along false edge.
@@ -825,7 +825,7 @@ Optional<PredicateConstraint> PredicateBase::getConstraint() const {
   case PT_Switch:
     if (Condition != RenamedOp) {
       // TODO: Make this an assertion once RenamedOp is fully accurate.
-      return None;
+      return std::nullopt;
     }
 
     return {{CmpInst::ICMP_EQ, cast<PredicateSwitch>(this)->CaseValue}};