ART: Detach libart-disassembler from libart

Some more intrusive changes than I would have liked, as long as
ART logging is different from libbase logging.

Fix up some includes.

Bug: 15436106
Bug: 31338270
Test: m test-art-host
Change-Id: I9fbe4b85b2d74e079a4981f3aec9af63b163a461
diff --git a/runtime/image.h b/runtime/image.h
index 8cd94bb..3a4fa79 100644
--- a/runtime/image.h
+++ b/runtime/image.h
@@ -157,9 +157,7 @@
     return reinterpret_cast<uint8_t*>(oat_file_end_);
   }
 
-  PointerSize GetPointerSize() const {
-    return ConvertToPointerSize(pointer_size_);
-  }
+  PointerSize GetPointerSize() const;
 
   uint32_t GetPointerSizeUnchecked() const {
     return pointer_size_;