ART: Add to comments

Follow-up to commit 9ea84d0bd33694162eb27d9d06bb687f8794a6a0.

Bug: 73667005
Test: m test-art-host
Change-Id: I77cc688a35fc9413eca4c352f88d2b31e8ca11d1
diff --git a/runtime/oat_file_assistant.cc b/runtime/oat_file_assistant.cc
index c5569ff..c96d825 100644
--- a/runtime/oat_file_assistant.cc
+++ b/runtime/oat_file_assistant.cc
@@ -1263,10 +1263,14 @@
 
   switch (Status()) {
     case kOatBootImageOutOfDate:
+      // OutOfDate may be either a mismatched image, or a missing image.
       if (oat_file_assistant_->HasOriginalDexFiles()) {
-        // If there are original dex files, it is better to use them.
+        // If there are original dex files, it is better to use them (to avoid a potential
+        // quickening mismatch because the boot image changed).
         break;
       }
+      // If we do not accept the oat file, we may not have access to dex bytecode at all. Grudgingly
+      // go forward.
       FALLTHROUGH_INTENDED;
 
     case kOatRelocationOutOfDate: