Break apart header files.

Create libart-gtest for common runtime and compiler gtest routines.
Rename CompilerCallbacksImpl that is quick compiler specific.
Rename trace clock source constants to not use the overloaded profiler term.

Change-Id: I4aac4bdc7e7850c68335f81e59a390133b54e933
diff --git a/compiler/optimizing/register_allocator.h b/compiler/optimizing/register_allocator.h
index 7d4cd1a..e35ff56 100644
--- a/compiler/optimizing/register_allocator.h
+++ b/compiler/optimizing/register_allocator.h
@@ -18,6 +18,7 @@
 #define ART_COMPILER_OPTIMIZING_REGISTER_ALLOCATOR_H_
 
 #include "base/macros.h"
+#include "primitive.h"
 #include "utils/growable_array.h"
 
 namespace art {