[Analysis] 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, 1 insertions, 1 deletions

diff --git a/llvm/lib/Analysis/BlockFrequencyInfoImpl.cpp b/llvm/lib/Analysis/BlockFrequencyInfoImpl.cpp
index ec8d318..be4a602 100644
--- a/llvm/lib/Analysis/BlockFrequencyInfoImpl.cpp
+++ b/llvm/lib/Analysis/BlockFrequencyInfoImpl.cpp
@@ -599,7 +599,7 @@ BlockFrequencyInfoImplBase::getProfileCountFromFreq(const Function &F,
                                                     bool AllowSynthetic) const {
   auto EntryCount = F.getEntryCount(AllowSynthetic);
   if (!EntryCount)
-    return None;
+    return std::nullopt;
   // Use 128 bit APInt to do the arithmetic to avoid overflow.
   APInt BlockCount(128, EntryCount->getCount());
   APInt BlockFreq(128, Freq);