Update comment in handleUnknownIntrinsicUnlogged

Author: thurstond

llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp

@@ -3046,7 +3046,8 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
       if (maybeHandleSimpleNomemIntrinsic(I))
         return true;
 
-    // FIXME: detect and handle SSE maskstore/maskload
+    // FIXME: detect and handle SSE maskstore/maskload?
+    // Some cases are now handled in handleAVXMasked{Load,Store}.
     return false;
   }