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/native/dalvik_system_VMDebug.cc b/runtime/native/dalvik_system_VMDebug.cc
index 8f108fa..f09c067 100644
--- a/runtime/native/dalvik_system_VMDebug.cc
+++ b/runtime/native/dalvik_system_VMDebug.cc
@@ -240,8 +240,8 @@
   ScopedObjectAccess soa(env);
   LOG(INFO) << "--- reference table dump ---";
 
-  soa.Env()->DumpReferenceTables(LOG(INFO));
-  soa.Vm()->DumpReferenceTables(LOG(INFO));
+  soa.Env()->DumpReferenceTables(LOG_STREAM(INFO));
+  soa.Vm()->DumpReferenceTables(LOG_STREAM(INFO));
 
   LOG(INFO) << "---";
 }