ART: Use libbase logging

Move most of our logging infrastructure over to system/core/base.
Retain VLOG.

Using unified Android infrastructure has two main advantages. First,
it reduces the complexity/maintenance burden in ART. Second, it
allows to detach logging for the cases where we do not want or need
a runtime, e.g., dexdump, the disassembler, etc. As a part of the
latter, libbase is also supported for all hosts (including Windows).

From a developer viewpoint, there are minor behavior changes for the
LOG statements (see above), but otherwise usage is the same. Explicit
severity enum items are in the android::base namespace now.

Bug: 31338270
Test: m test-art-host
Change-Id: I5abcb2f45f5b03d49951874c48544f72a283a91b
diff --git a/runtime/jni_env_ext-inl.h b/runtime/jni_env_ext-inl.h
index dc6a3e8..5967eee 100644
--- a/runtime/jni_env_ext-inl.h
+++ b/runtime/jni_env_ext-inl.h
@@ -32,9 +32,10 @@
     if (check_jni) {
       size_t entry_count = locals.Capacity();
       if (entry_count > 16) {
-        locals.Dump(LOG(WARNING) << "Warning: more than 16 JNI local references: "
-            << entry_count << " (most recent was a " << PrettyTypeOf(obj) << ")\n");
-        // TODO: LOG(FATAL) in a later release?
+        locals.Dump(LOG_STREAM(WARNING) << "Warning: more than 16 JNI local references: "
+                                            << entry_count << " (most recent was a "
+                                            << PrettyTypeOf(obj) << ")\n");
+      // TODO: LOG(FATAL) in a later release?
       }
     }
   }