move comment into define

Signed-off-by: Sarnie, Nick <[email protected]>

Author: sarnex

clang/lib/AST/Type.cpp

@@ -4911,9 +4911,9 @@ std::optional<NullabilityKind> Type::getNullability() const {
 bool Type::canHaveNullability(bool ResultIfUnknown) const {
   QualType type = getCanonicalTypeInternal();
 
-  // We'll only see canonical types here.
   switch (type->getTypeClass()) {
 #define NON_CANONICAL_TYPE(Class, Parent)                                      \
+  // We'll only see canonical types here.                                      \
   case Type::Class:                                                            \
     llvm_unreachable("non-canonical type");
 #define TYPE(Class, Parent)