[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/Instrumentation/SanitizerCoverage.cpp b/llvm/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
index 697eacf..43f0658 100644
--- a/llvm/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
+++ b/llvm/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
@@ -251,7 +251,7 @@ private:
                                                 Type *Ty);
 
   void SetNoSanitizeMetadata(Instruction *I) {
-    I->setMetadata(LLVMContext::MD_nosanitize, MDNode::get(*C, None));
+    I->setMetadata(LLVMContext::MD_nosanitize, MDNode::get(*C, std::nullopt));
   }
 
   std::string getSectionName(const std::string &Section) const;