Header library to remove dependence on runtime/

Add a new header library to remove libdexfile and others' dependence on
runtime (typically runtime/base) includes in libdexfile.  Also a small step
to tease dexlayout and profman away from relying on these as well.

Bug: 22322814
Test: make -j 50 checkbuild
      make -j 50 test-art-host-gtest

Change-Id: I38e2fe399a75f4bc6318c77a71954c00ea73ec2b
diff --git a/runtime/class_linker.cc b/runtime/class_linker.cc
index f18e0b4..c667fe2 100644
--- a/runtime/class_linker.cc
+++ b/runtime/class_linker.cc
@@ -36,6 +36,7 @@
 #include "art_method-inl.h"
 #include "base/arena_allocator.h"
 #include "base/casts.h"
+#include "base/leb128.h"
 #include "base/logging.h"
 #include "base/scoped_arena_containers.h"
 #include "base/scoped_flock.h"
@@ -79,7 +80,6 @@
 #include "jit/jit_code_cache.h"
 #include "jit/profile_compilation_info.h"
 #include "jni_internal.h"
-#include "leb128.h"
 #include "linear_alloc.h"
 #include "mirror/call_site.h"
 #include "mirror/class-inl.h"