[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, 6 insertions, 6 deletions

diff --git a/llvm/lib/Transforms/Utils/LoopUtils.cpp b/llvm/lib/Transforms/Utils/LoopUtils.cpp
index b69735a..9ada3a2d 100644
--- a/llvm/lib/Transforms/Utils/LoopUtils.cpp
+++ b/llvm/lib/Transforms/Utils/LoopUtils.cpp
@@ -258,7 +258,7 @@ llvm::getOptionalElementCountLoopAttribute(const Loop *TheLoop) {
     return ElementCount::get(*Width, IsScalable.value_or(false));
   }
 
-  return None;
+  return std::nullopt;
 }
 
 Optional<MDNode *> llvm::makeFollowupLoopID(
@@ -267,7 +267,7 @@ Optional<MDNode *> llvm::makeFollowupLoopID(
   if (!OrigLoopID) {
     if (AlwaysNew)
       return nullptr;
-    return None;
+    return std::nullopt;
   }
 
   assert(OrigLoopID->getOperand(0) == OrigLoopID);
@@ -326,7 +326,7 @@ Optional<MDNode *> llvm::makeFollowupLoopID(
   // Attributes of the followup loop not specified explicity, so signal to the
   // transformation pass to add suitable attributes.
   if (!AlwaysNew && !HasAnyFollowup)
-    return None;
+    return std::nullopt;
 
   // If no attributes were added or remove, the previous loop Id can be reused.
   if (!AlwaysNew && !Changed)
@@ -790,14 +790,14 @@ getEstimatedTripCount(BranchInst *ExitingBranch, Loop *L,
   // we exited the loop.
   uint64_t LoopWeight, ExitWeight;
   if (!extractBranchWeights(*ExitingBranch, LoopWeight, ExitWeight))
-    return None;
+    return std::nullopt;
 
   if (L->contains(ExitingBranch->getSuccessor(1)))
     std::swap(LoopWeight, ExitWeight);
 
   if (!ExitWeight)
     // Don't have a way to return predicated infinite
-    return None;
+    return std::nullopt;
 
   OrigExitWeight = ExitWeight;
 
@@ -824,7 +824,7 @@ llvm::getLoopEstimatedTripCount(Loop *L,
       return *EstTripCount;
     }
   }
-  return None;
+  return std::nullopt;
 }
 
 bool llvm::setLoopEstimatedTripCount(Loop *L, unsigned EstimatedTripCount,