[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, 1 insertions, 1 deletions

diff --git a/llvm/lib/Transforms/IPO/ArgumentPromotion.cpp b/llvm/lib/Transforms/IPO/ArgumentPromotion.cpp
index 8c77b69..467ab7f 100644
--- a/llvm/lib/Transforms/IPO/ArgumentPromotion.cpp
+++ b/llvm/lib/Transforms/IPO/ArgumentPromotion.cpp
@@ -489,7 +489,7 @@ static bool findArgParts(Argument *Arg, const DataLayout &DL, AAResults &AAR,
     Ptr = Ptr->stripAndAccumulateConstantOffsets(DL, Offset,
                                                  /* AllowNonInbounds */ true);
     if (Ptr != Arg)
-      return None;
+      return std::nullopt;
 
     if (Offset.getSignificantBits() >= 64)
       return false;