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/dex2oat/Android.bp b/dex2oat/Android.bp
index 11c18b0..931bbd3 100644
--- a/dex2oat/Android.bp
+++ b/dex2oat/Android.bp
@@ -49,6 +49,7 @@
     shared_libs: [
         "libart",
         "libart-compiler",
+        "libbase",
         "libsigchain",
     ],
 }
@@ -62,6 +63,7 @@
     shared_libs: [
         "libartd",
         "libartd-compiler",
+        "libbase",
         "libsigchain",
     ],
 }