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/gc/space/image_space.cc b/runtime/gc/space/image_space.cc
index 9c91732..a40e408 100644
--- a/runtime/gc/space/image_space.cc
+++ b/runtime/gc/space/image_space.cc
@@ -728,7 +728,7 @@
 
     VLOG(image) << "ImageSpace::Init exiting " << *space.get();
     if (VLOG_IS_ON(image)) {
-      logger.Dump(LOG(INFO));
+      logger.Dump(LOG_STREAM(INFO));
     }
     return space;
   }
@@ -1298,7 +1298,7 @@
       }
     }
     if (VLOG_IS_ON(image)) {
-      logger.Dump(LOG(INFO));
+      logger.Dump(LOG_STREAM(INFO));
     }
     return true;
   }