Reduce 'The ClassLoaderContext is a special shared library.' spam

This message may appear 90+ times consecutively, so put it behind
VLOG(oat) so that it only appears when verbose oat logs are enabled.

Bug: 154178702
Test: this message is only seen once per process
Change-Id: I57c307d8910058f626145b2c899c7c4e9e354533
diff --git a/runtime/class_loader_context.cc b/runtime/class_loader_context.cc
index 98e33e2..74f464c 100644
--- a/runtime/class_loader_context.cc
+++ b/runtime/class_loader_context.cc
@@ -321,7 +321,8 @@
   // Stop early if we detect the special shared library, which may be passed as the classpath
   // for dex2oat when we want to skip the shared libraries check.
   if (spec == OatFile::kSpecialSharedLibrary) {
-    LOG(INFO) << "The ClassLoaderContext is a special shared library.";
+    // TODO(calin): move this out from parsing to the oat manager to prevent log spam.
+    VLOG(oat) << "The ClassLoaderContext is a special shared library.";
     special_shared_library_ = true;
     return true;
   }