[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, 2 insertions, 2 deletions

diff --git a/llvm/lib/CodeGen/MachineBlockFrequencyInfo.cpp b/llvm/lib/CodeGen/MachineBlockFrequencyInfo.cpp
index c569f03..afe0786 100644
--- a/llvm/lib/CodeGen/MachineBlockFrequencyInfo.cpp
+++ b/llvm/lib/CodeGen/MachineBlockFrequencyInfo.cpp
@@ -234,7 +234,7 @@ MachineBlockFrequencyInfo::getBlockFreq(const MachineBasicBlock *MBB) const {
 Optional<uint64_t> MachineBlockFrequencyInfo::getBlockProfileCount(
     const MachineBasicBlock *MBB) const {
   if (!MBFI)
-    return None;
+    return std::nullopt;
 
   const Function &F = MBFI->getFunction()->getFunction();
   return MBFI->getBlockProfileCount(F, MBB);
@@ -243,7 +243,7 @@ Optional<uint64_t> MachineBlockFrequencyInfo::getBlockProfileCount(
 Optional<uint64_t>
 MachineBlockFrequencyInfo::getProfileCountFromFreq(uint64_t Freq) const {
   if (!MBFI)
-    return None;
+    return std::nullopt;
 
   const Function &F = MBFI->getFunction()->getFunction();
   return MBFI->getProfileCountFromFreq(F, Freq);