[llvm] Use std::nullopt instead of None in comments (NFC)

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, 1 deletions

diff --git a/llvm/lib/ProfileData/Coverage/CoverageMapping.cpp b/llvm/lib/ProfileData/Coverage/CoverageMapping.cpp
index 51a2503..ac36650 100644
--- a/llvm/lib/ProfileData/Coverage/CoverageMapping.cpp
+++ b/llvm/lib/ProfileData/Coverage/CoverageMapping.cpp
@@ -689,7 +689,8 @@ static Optional<unsigned> findMainViewFileID(const FunctionRecord &Function) {
 }
 
 /// Check if SourceFile is the file that contains the definition of
-/// the Function. Return the ID of the file in that case or None otherwise.
+/// the Function. Return the ID of the file in that case or std::nullopt
+/// otherwise.
 static Optional<unsigned> findMainViewFileID(StringRef SourceFile,
                                              const FunctionRecord &Function) {
   Optional<unsigned> I = findMainViewFileID(Function);