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/compiler/optimizing/code_generator.cc b/compiler/optimizing/code_generator.cc
index 01155dc..ff59173 100644
--- a/compiler/optimizing/code_generator.cc
+++ b/compiler/optimizing/code_generator.cc
@@ -43,6 +43,7 @@
 #include "base/bit_utils.h"
 #include "base/bit_utils_iterator.h"
 #include "base/casts.h"
+#include "base/leb128.h"
 #include "bytecode_utils.h"
 #include "class_linker.h"
 #include "compiled_method.h"
@@ -52,7 +53,6 @@
 #include "graph_visualizer.h"
 #include "intern_table.h"
 #include "intrinsics.h"
-#include "leb128.h"
 #include "mirror/array-inl.h"
 #include "mirror/object_array-inl.h"
 #include "mirror/object_reference.h"