[clang] Use std::optional::value_or (NFC) (#109894)

Author: kazutakahirata

clang/include/clang/AST/PropertiesBase.td

@@ -39,7 +39,7 @@ class EnumPropertyType<string typeName = ""> : PropertyType<typeName> {}
 /// Supports optional values by using the null representation.
 class RefPropertyType<string className> : PropertyType<className # "*"> {
   let PackOptional =
-    "value ? *value : nullptr";
+    "value.value_or(nullptr)";
   let UnpackOptional =
     "value ? std::optional<" # CXXName # ">(value) : std::nullopt";
 }

clang/include/clang/Basic/FileManager.h

@@ -293,7 +293,7 @@ class FileManager : public RefCountedBase<FileManager> {
                    bool RequiresNullTerminator = true,
                    std::optional<int64_t> MaybeLimit = std::nullopt) const {
     return getBufferForFileImpl(Filename,
-                                /*FileSize=*/(MaybeLimit ? *MaybeLimit : -1),
+                                /*FileSize=*/MaybeLimit.value_or(-1),
                                 isVolatile, RequiresNullTerminator);
   }
 

clang/lib/APINotes/APINotesYAMLCompiler.cpp

@@ -757,8 +757,8 @@ class YAMLConverter {
       OutInfo.addTypeInfo(idx++, N);
     audited = Nullability.size() > 0 || ReturnNullability;
     if (audited)
-      OutInfo.addTypeInfo(0, ReturnNullability ? *ReturnNullability
-                                               : NullabilityKind::NonNull);
+      OutInfo.addTypeInfo(0,
+                          ReturnNullability.value_or(NullabilityKind::NonNull));
     if (!audited)
       return;
     OutInfo.NullabilityAudited = audited;